Gemfile in tweet_sanitizer-0.2.0 vs Gemfile in tweet_sanitizer-0.2.1

@@ -2,5 +2,12 @@
 
 git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
 
 # Specify your gem's dependencies in tweet_sanitizer.gemspec
 gemspec
+
+if Gem::Version.create(RUBY_VERSION) < Gem::Version.create("2.5.0")
+  group :test do
+    # NOTE: unparser v0.3.0+ requires Ruby 2.5+
+    gem "unparser", "< 0.3.0"
+  end
+end