* fix RuboCop error
RuboCop doesn't work by following error.
```
$ rubocop
Error: The `Style/TrailingCommaInLiteral` cop no longer exists. Please use `Style/TrailingCommaInArrayLiteral` and/or `Style/TrailingCommaInHashLiteral` instead.
(obsolete configuration found in .rubocop.yml, please update it)
```
it comes from RuboCop 0.53.0 [\[Fix #3394\] Separate Array & Hash Literal Comma configuration by garettarrowood · Pull Request #5307 · bbatsov/rubocop](https://github.com/bbatsov/rubocop/pull/5307)
* ci(CodeClimate): specify RuboCop version 0.54
* https://docs.codeclimate.com/docs/rubocop#section-using-rubocop-s-newer-versions
* [RuboCop 0.55.0 is not available yet](https://github.com/codeclimate/codeclimate-rubocop/issues/121) on CodeClimate rubocop channel
* Add handling of Linked Data Signatures in payloads
* Add a way to sign JSON, fix canonicalization of signature options
* Fix signatureValue encoding, send out signed JSON when distributing
* Add missing security context
There are many spots throughout the codebase which are showing as covered by
specs in the simplecov output -- but which are not actually run, because they
are on the same line as a guard clause.
I plan on fixing some of these issues, but don't want to keep triggering this
rubocop style violation.
My preference would be that we use the PR review process to identify places
where a guard clause might be appropriate, but that we leave this cop turned off
by default.
application website validation, don't link to app website if website isn't set,
also comment out animated boost icon from #464 until it's consistent with non-animated version
Chikahiro Tokoro