update rubocop configs

.github/workflows/main.yml

@@ -10,6 +10,7 @@ jobs:
 
       matrix:
         ruby-version:
+          - '2.6'
           - '2.7'
           - '3.0'
           - '3.1'

.rubocop.yml

@@ -1,14 +1,10 @@
 AllCops:
   TargetRubyVersion: 2.6
   DisplayCopNames: true
-  NewCops: enable
 
 Bundler/DuplicatedGem:
   Enabled: false
 
-Gemspec/RequiredRubyVersion:
-  Enabled: false
-
 Layout/AccessModifierIndentation:
   EnforcedStyle: outdent
 
@@ -76,5 +72,155 @@ Style/TrailingCommaInHashLiteral:
 Style/TrailingCommaInArrayLiteral:
   EnforcedStyleForMultiline: "comma"
 
-Gemspec/RequireMFA:
-  Enabled: false
+Gemspec/DateAssignment: # new in 1.10
+  Enabled: true
+
+Layout/LineEndStringConcatenationIndentation: # new in 1.18
+  Enabled: true
+
+Layout/SpaceBeforeBrackets: # new in 1.7
+  Enabled: true
+
+Lint/AmbiguousAssignment: # new in 1.7
+  Enabled: true
+
+Lint/AmbiguousOperatorPrecedence: # new in 1.21
+  Enabled: true
+
+Lint/AmbiguousRange: # new in 1.19
+  Enabled: true
+
+Lint/DeprecatedConstants: # new in 1.8
+  Enabled: true
+
+Lint/DuplicateBranch: # new in 1.3
+  Enabled: true
+
+Lint/DuplicateRegexpCharacterClassElement: # new in 1.1
+  Enabled: true
+
+Lint/EmptyBlock: # new in 1.1
+  Enabled: true
+
+Lint/EmptyClass: # new in 1.3
+  Enabled: true
+
+Lint/EmptyInPattern: # new in 1.16
+  Enabled: true
+
+Lint/IncompatibleIoSelectWithFiberScheduler: # new in 1.21
+  Enabled: true
+
+Lint/LambdaWithoutLiteralBlock: # new in 1.8
+  Enabled: true
+
+Lint/NoReturnInBeginEndBlocks: # new in 1.2
+  Enabled: true
+
+Lint/NumberedParameterAssignment: # new in 1.9
+  Enabled: true
+
+Lint/OrAssignmentToConstant: # new in 1.9
+  Enabled: true
+
+Lint/RedundantDirGlobSort: # new in 1.8
+  Enabled: true
+
+Lint/RequireRelativeSelfPath: # new in 1.22
+  Enabled: true
+
+Lint/SymbolConversion: # new in 1.9
+  Enabled: true
+
+Lint/ToEnumArguments: # new in 1.1
+  Enabled: true
+
+Lint/TripleQuotes: # new in 1.9
+  Enabled: true
+
+Lint/UnexpectedBlockArity: # new in 1.5
+  Enabled: true
+
+Lint/UnmodifiedReduceAccumulator: # new in 1.1
+  Enabled: true
+
+Lint/UselessRuby2Keywords: # new in 1.23
+  Enabled: true
+
+Naming/BlockForwarding: # new in 1.24
+  Enabled: true
+
+Security/IoMethods: # new in 1.22
+  Enabled: true
+
+Style/ArgumentsForwarding: # new in 1.1
+  Enabled: true
+
+Style/CollectionCompact: # new in 1.2
+  Enabled: true
+
+Style/DocumentDynamicEvalDefinition: # new in 1.1
+  Enabled: true
+
+Style/EndlessMethod: # new in 1.8
+  Enabled: true
+
+Style/FileRead: # new in 1.24
+  Enabled: true
+
+Style/FileWrite: # new in 1.24
+  Enabled: true
+
+Style/HashConversion: # new in 1.10
+  Enabled: true
+
+Style/HashExcept: # new in 1.7
+  Enabled: true
+
+Style/IfWithBooleanLiteralBranches: # new in 1.9
+  Enabled: true
+
+Style/InPatternThen: # new in 1.16
+  Enabled: true
+
+Style/MapToHash: # new in 1.24
+  Enabled: true
+
+Style/MultilineInPatternThen: # new in 1.16
+  Enabled: true
+
+Style/NegatedIfElseCondition: # new in 1.2
+  Enabled: true
+
+Style/NestedFileDirname: # new in 1.26
+  Enabled: true
+
+Style/NilLambda: # new in 1.3
+  Enabled: true
+
+Style/NumberedParameters: # new in 1.22
+  Enabled: true
+
+Style/NumberedParametersLimit: # new in 1.22
+  Enabled: true
+
+Style/OpenStructUse: # new in 1.23
+  Enabled: true
+
+Style/QuotedSymbols: # new in 1.16
+  Enabled: true
+
+Style/RedundantArgument: # new in 1.4
+  Enabled: true
+
+Style/RedundantSelfAssignmentBranch: # new in 1.19
+  Enabled: true
+
+Style/SelectByRegexp: # new in 1.22
+  Enabled: true
+
+Style/StringChars: # new in 1.12
+  Enabled: true
+
+Style/SwapValues: # new in 1.1
+  Enabled: true

simplecov-html.gemspec

@@ -14,7 +14,7 @@ Gem::Specification.new do |gem|
   gem.summary     = gem.description
   gem.license     = "MIT"
 
-  gem.required_ruby_version = ">= 2.4"
+  gem.required_ruby_version = ">= 2.6"
 
   gem.files         = `git ls-files`.split("\n")
   gem.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")