Revert "Revert "Use ActiveSupport Hash#deep_merge" (#111)"

This reverts commit 3135c0d.

Closes #114.

Signed-off-by: Michka Popoff <michkapopoff@gmail.com>

cmd/brew-test-bot.rb

@@ -1367,7 +1367,7 @@ def test_ci_upload(tap)
 
     json_files = Dir.glob("*.bottle.json")
     bottles_hash = json_files.reduce({}) do |hash, json_file|
-      deep_merge_hashes hash, JSON.parse(IO.read(json_file))
+      hash.deep_merge(JSON.parse(IO.read(json_file)))
     end
 
     if ARGV.include?("--dry-run")