Bump RuboCop to v0.91.x (#8391)

Merge pull request 8391

.rubocop.yml

@@ -22,6 +22,8 @@ AllCops:
     - vendor/**/*
     - tmp/**/*
 
+Layout/BeginEndAlignment:
+  Enabled: true
 Layout/EmptyComment:
   Enabled: false
 Layout/EmptyLinesAroundAttributeAccessor:
@@ -53,6 +55,10 @@ Layout/SpaceAroundMethodCallOperator:
 
 Lint/BinaryOperatorWithIdenticalOperands:
   Enabled: true
+Lint/ConstantDefinitionInBlock:
+  Enabled: true
+  Exclude:
+    - test/**/*.rb
 Lint/DeprecatedOpenSSLConstant:
   Enabled: true
 Lint/DuplicateElsifCondition:
@@ -67,6 +73,8 @@ Lint/EmptyFile:
   Enabled: true
 Lint/FloatComparison:
   Enabled: true
+Lint/IdentityComparison:
+  Enabled: true
 Lint/MissingSuper:
   Enabled: false
 Lint/MixedRegexpCaptureTypes:
@@ -92,6 +100,8 @@ Lint/UnreachableLoop:
   Enabled: true
 Lint/UselessMethodDefinition:
   Enabled: true
+Lint/UselessTimes:
+  Enabled: true
 Lint/Void:
   Exclude:
     - lib/jekyll/site.rb

Gemfile

@@ -23,7 +23,7 @@ group :test do
   gem "nokogiri", "~> 1.7"
   gem "rspec"
   gem "rspec-mocks"
-  gem "rubocop", "~> 0.90.0"
+  gem "rubocop", "~> 0.91.0"
   gem "rubocop-performance"
   gem "test-dependency-theme", :path => File.expand_path("test/fixtures/test-dependency-theme", __dir__)
   gem "test-theme", :path => File.expand_path("test/fixtures/test-theme", __dir__)