Fix rubocop offence for Style/FrozenStringLiteralComment

kamipo · kamipo · commit 9e6f9bc7732e · 2019-04-05T00:31:41.000+09:00
```
% be rubocop -a
Inspecting 2777 files
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Offenses:

tools/test_common.rb:1:1: C: [Corrected] Style/FrozenStringLiteralComment: Missing magic comment # frozen_string_literal: true.
if ENV["BUILDKITE"]
^

2777 files inspected, 1 offense detected, 1 offense corrected
```
diff --git a/tools/test_common.rb b/tools/test_common.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 if ENV["BUILDKITE"]
   require "minitest/reporters"
   require "fileutils"

Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,5 @@`
	`1`	`+# frozen_string_literal: true`
	`2`	`+`
`1`	`3`	`if ENV["BUILDKITE"]`
`2`	`4`	`require "minitest/reporters"`
`3`	`5`	`require "fileutils"`