rename gemspec filename

README.md

@@ -5,7 +5,7 @@
 Add this line to your application's Gemfile:
 
 ```ruby
-gem 'dingtalk-sdk'
+gem "dingtalk_sdk", github: "https://github.com/francistm/dingtalk-sdk"
 ```
 
 And then execute:
@@ -28,7 +28,7 @@ To install this gem onto your local machine, run `bundle exec rake install`. To
 
 ## Contributing
 
-Bug reports and pull requests are welcome on GitHub at https://github.com/[USERNAME]/dingtalk. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [Contributor Covenant](http://contributor-covenant.org) code of conduct.
+Bug reports and pull requests are welcome on GitHub at https://github.com/francistm/dingtalk-sdk. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [Contributor Covenant](http://contributor-covenant.org) code of conduct.
 
 ## License