Add rexml for aws-sdk-core on Ruby 3.0

I believe that rexml was shipping with ruby before, but now it's not anymore, and aws-sdk-core requires an XML library. So we add it to development dependencies.

Add rexml for aws-sdk-core on Ruby 3.0
1f374062 · Janko Marohnić · 5d381f4d · 1f374062
Commit 1f374062 authored Aug 27, 2021 by Janko Marohnić
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uppy-s3_multipart.gemspec uppy-s3_multipart.gemspec +1 -0

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--- a/uppy-s3_multipart.gemspec
+++ b/uppy-s3_multipart.gemspec
@@ -23,4 +23,5 @@ Gem::Specification.new do |gem|
  gem.add_development_dependency "shrine", "~> 2.13"
  gem.add_development_dependency "shrine-memory"
  gem.add_development_dependency "aws-sdk-core", "~> 3.23"
+  gem.add_development_dependency "rexml"
 end