Stop generating changelog after release

It doesn't pick up on changes anyway, because GitHub's API takes time to
return new data.

Author: danielberkompas

bin/release

@@ -11,9 +11,5 @@ continue = system "git tag v#{version}" if continue
 continue = system "git push" if continue
 continue = system "git push -f origin v#{version}" if continue
 continue = system "mix hex.publish" if continue
-continue = system "github_changelog_generator" if continue
-continue = system "git add ." if continue
-continue = system "git commit -am \"Update changelog for version #{version}\"" if continue
-continue = system "git push" if continue
 
 puts "Version #{version} was successfully released!"