- Layout/TrailingWhitespace

```
actionpack/lib/action_controller/metal/request_forgery_protection.rb:49:4:
C: Layout/TrailingWhitespace: Trailing whitespace detected.
  #
   ^
```

Related to c3787494

- Performance/StartWith

```
tasks/release.rb:108:44: C: Performance/StartWith:
Use String#start_with? instead of a regex match anchored to the beginning of the string.
      header += "*   No changes.\n\n\n" if current_contents =~ /\A##/
```