Enable a few pending cops

We released rubocop-rspec v2.26.0, so we update and enable a few pending cops.
and follow: rubocop/rubocop-capybara#84

.rubocop.yml

@@ -122,12 +122,18 @@ Layout/LineContinuationSpacing:
   Enabled: true
 Layout/LineEndStringConcatenationIndentation:
   Enabled: true
+Lint/AmbiguousOperatorPrecedence:
+  Enabled: true
+Lint/NonAtomicFileOperation:
+  Enabled: true
 Style/EmptyHeredoc:
   Enabled: true
 Style/RedundantHeredocDelimiterQuotes:
   Enabled: true
 Style/RedundantStringEscape:
   Enabled: true
+Style/ReturnNilInPredicateMethodDefinition:
+  Enabled: true
 
 # Enable pending rubocop-rspec cops.
 
@@ -145,6 +151,10 @@ RSpec/ContainExactly:
   Enabled: true
 RSpec/DuplicatedMetadata:
   Enabled: true
+RSpec/EmptyMetadata:
+  Enabled: true
+RSpec/Eq:
+  Enabled: true
 RSpec/ExcessiveDocstringSpacing:
   Enabled: true
 RSpec/IdenticalEqualityAssertion:
@@ -153,16 +163,26 @@ RSpec/IndexedLet:
   Enabled: true
 RSpec/MatchArray:
   Enabled: true
+RSpec/MetadataStyle:
+  Enabled: true
 RSpec/NoExpectationExample:
   Enabled: true
 RSpec/PendingWithoutReason:
   Enabled: true
+RSpec/ReceiveMessages:
+  Enabled: true
 RSpec/RedundantAround:
   Enabled: true
+RSpec/RedundantPredicateMatcher:
+  Enabled: true
+RSpec/RemoveConst:
+  Enabled: true
 RSpec/SkipBlockInsideExample:
   Enabled: true
 RSpec/SortMetadata:
   Enabled: true
+RSpec/SpecFilePathSuffix:
+  Enabled: true
 RSpec/SubjectDeclaration:
   Enabled: true
 RSpec/VerifiedDoubleReference:

Gemfile

@@ -11,7 +11,7 @@ gem 'rake'
 gem 'rspec', '~> 3.11'
 gem 'rubocop-performance', '~> 1.7'
 gem 'rubocop-rake', '~> 0.6'
-gem 'rubocop-rspec', '~> 2.20.0'
+gem 'rubocop-rspec', '~> 2.26.0'
 gem 'simplecov', '>= 0.19'
 gem 'yard'