Update rubopcop (#227)

* Update rubopcop [WIP]

* Further rubocop fixes

* Fix rubocop-rails cops

* Fix spec

* Disable rubocop suggestions

* Run rubocop in github actions rather than in codeclimate

lib/telegram/bot/config_methods.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'active_support/core_ext/hash/keys'
 require 'active_support/core_ext/hash/indifferent_access'
 
@@ -44,7 +46,7 @@ module Telegram
       # from `secrets.yml` merging `telegram['bot']` at `:default` key.
       #
       # Can be overwritten with .bots_config=
-      def bots_config
+      def bots_config # rubocop:disable Metrics/PerceivedComplexity
         @bots_config ||=
           if defined?(Rails.application)
             app = Rails.application