Fixed CHANGELOG.md to add link to each PR (#751)

CHANGELOG.md

 ## 3.0.3
-- Use a less error-prone way of specifying gem files (#662)
-- Update rake requirement from `>= 10.4, < 13.0` to `>= 10.4, < 14.0` (#659)
-- Bump nokogiri from 1.6.6.2 to 1.10.4 in /spec/integration/rails_4.2.0 (#655)
-- Default annotate models to true in config generated by `rails g annotate:install` (#671)
-- Bump loofah from 2.3.0 to 2.3.1 in /spec/integration/rails_4.2.0 (#681)
+- Use a less error-prone way of specifying gem files [#662](https://github.com/ctran/annotate_models/pull/662)
+- Update rake requirement from `>= 10.4, < 13.0` to `>= 10.4, < 14.0` [#659](https://github.com/ctran/annotate_models/pull/659)
+- Bump nokogiri from 1.6.6.2 to 1.10.4 in /spec/integration/rails_4.2.0 [#655](https://github.com/ctran/annotate_models/pull/655)
+- Default annotate models to true in config generated by `rails g annotate:install` [#671](https://github.com/ctran/annotate_models/pull/671)
+- Bump loofah from 2.3.0 to 2.3.1 in /spec/integration/rails_4.2.0 [#681](https://github.com/ctran/annotate_models/pull/681)
 
 ## 3.0.2
-- Fixes `LoadError` due to gemspec not referencing `parser.rb`, issue #657 (#660)
-- Changes `--additional_file_patterns` to use dashes `--additional-file-patterns` for consistency (#649)
-- Refactor: moving constants into `constants.rb` (#653)
+- Fixes `LoadError` due to gemspec not referencing `parser.rb`, issue [#657](https://github.com/ctran/annotate_models/issues/657) [#660](https://github.com/ctran/annotate_models/pull/660)
+- Changes `--additional_file_patterns` to use dashes `--additional-file-patterns` for consistency [#649](https://github.com/ctran/annotate_models/pull/649)
+- Refactor: moving constants into `constants.rb` [#653](https://github.com/ctran/annotate_models/pull/653)
 
 ## 3.0.1
-- Skipped as an official release, used the 3.0.1 patch for setting up Github Actions (#619)
+- Skipped as an official release, used the 3.0.1 patch for setting up Github Actions [#619](https://github.com/ctran/annotate_models/pull/619)
 
 ## 3.0.0
 - **Breaking:** when option `models` is not set - models will not be annotated by default.
 
   Add `'models'=>'true'` to your config manually or use `--models` option if using CLI.
 
-- Added `--models` CLI option fixing issue #563 (#647)
-- Added `--additional_file_patterns` option for additional file patterns (#633) (#636) (#637)
-- Refactored CLI parser (#646)
-- Fixed `BigDecimal.new` deprecation warning (#634)
-- Fixed annotations for columns with long data types (#622)
-- Made methods private in AnnotateRoutes (#598)
+- Added `--models` CLI option fixing issue [#563](https://github.com/ctran/annotate_models/issues/563) [#647](https://github.com/ctran/annotate_models/pull/647)
+- Added `--additional_file_patterns` option for additional file patterns [#633](https://github.com/ctran/annotate_models/pull/633) [#636](https://github.com/ctran/annotate_models/pull/636) [#637](https://github.com/ctran/annotate_models/pull/637)
+- Refactored CLI parser [#646](https://github.com/ctran/annotate_models/pull/646)
+- Fixed `BigDecimal.new` deprecation warning [#634](https://github.com/ctran/annotate_models/pull/634)
+- Fixed annotations for columns with long data types [#622](https://github.com/ctran/annotate_models/pull/622)
+- Made methods private in AnnotateRoutes [#598](https://github.com/ctran/annotate_models/pull/598)
 
 See https://github.com/ctran/annotate_models/releases/tag/v3.0.0
 
@@ -43,39 +43,39 @@ See https://github.com/ctran/annotate_models/releases/tag/v2.7.1
 See https://github.com/ctran/annotate_models/releases/tag/v2.7.0
 
 ## 2.6.9
-- Support foreigh key (#241)
-- Check if model has skip tag in annotate_model_file (#167)
-- Fix issue where serializer-related flags weren't being honored (#246)
-- Prefer SQL column type over normalized AR type (#231)
+- Support foreigh key [#241](https://github.com/ctran/annotate_models/pull/241)
+- Check if model has skip tag in annotate_model_file [#167](https://github.com/ctran/annotate_models/pull/167)
+- Fix issue where serializer-related flags weren't being honored [#246](https://github.com/ctran/annotate_models/issues/246)
+- Prefer SQL column type over normalized AR type [#231](https://github.com/ctran/annotate_models/issues/231)
 
 ## 2.6.8
-- Nothing annotated unless `options[:model_dir]` is specified, #234
+- Nothing annotated unless `options[:model_dir]` is specified, [#234](https://github.com/ctran/annotate_models/pull/234)
 
 ## 2.6.7
-- Nothing annotated unless `options[:model_dir]` is specified, #234
+- Nothing annotated unless `options[:model_dir]` is specified, [#234](https://github.com/ctran/annotate_models/pull/234)
 
 ## 2.6.6
-- Makes it possible to wrap annotations, #225
-- Fix single model generation, #214
-- Fix default value for Rails 4.2, #212
-- Don't crash on inherited models in subdirectories, #232
-- Process model_dir in rake task, #197
+- Makes it possible to wrap annotations, [#225](https://github.com/ctran/annotate_models/pull/225)
+- Fix single model generation, [#214](https://github.com/ctran/annotate_models/pull/214)
+- Fix default value for Rails 4.2, [#212](https://github.com/ctran/annotate_models/issues/212)
+- Don't crash on inherited models in subdirectories, [#232](https://github.com/ctran/annotate_models/issues/232)
+- Process model_dir in rake task, [#197](https://github.com/ctran/annotate_models/pull/197)
 
 ## 2.6.4
-- Skip "models/concerns", #194
-- Fix #173 where annotate says "Nothing to annotate" in rails 4.2
-- Display an error message if not run from the root of the project, #186
-- Support rails 4.0 new default test directory, #182
-- Add an option to show timestamp in routes "-timestamp", #136
-- Skip plain ruby objects if they have the same class name as an ActiveRecord object, #121
+- Skip "models/concerns", [#194](https://github.com/ctran/annotate_models/pull/194)
+- Fix [#173](https://github.com/ctran/annotate_models/issues/173) where annotate says "Nothing to annotate" in rails 4.2
+- Display an error message if not run from the root of the project, [#186](https://github.com/ctran/annotate_models/pull/186)
+- Support rails 4.0 new default test directory, [#182](https://github.com/ctran/annotate_models/issues/182)
+- Add an option to show timestamp in routes "-timestamp", [#136](https://github.com/ctran/annotate_models/issues/136)
+- Skip plain ruby objects if they have the same class name as an ActiveRecord object, [#121](https://github.com/ctran/annotate_models/issues/121)
 
 ## 2.6.3
-- Fix bug of annotate position in routes (#158)
+- Fix bug of annotate position in routes [#158](https://github.com/ctran/annotate_models/issues/158)
 
 ## 2.6.2
 - Retain the current annotate block unless --force is specified
 - Always load models, since they may not be autoloaded by Rails
-- The pg array type is now detected (see #158)
+- The pg array type is now detected (see [#158](https://github.com/ctran/annotate_models/pull/158))
 
 ## 2.6.0.beta2
 - support for composite_primary_keys (garysweaver)