Merge pull request #34 from DeployGate/feat/use_ruby26

Upgrade ruby version to 2.6

.rubocop.yml

@@ -11,7 +11,7 @@ AllCops:
   SuggestExtensions: false
 
 Style/ObjectThen:
-  EnforcedStyle: yield_self # then has been introduced since 2.6 but this cop does not take of the target ruby version
+  EnforcedStyle: yield_self
 
 Metrics/ModuleLength:
   Exclude:
@@ -145,7 +145,7 @@ Layout/HeredocIndentation:
 Style/SpecialGlobalVars:
   Enabled: false
 
-PercentLiteralDelimiters:
+Style/PercentLiteralDelimiters:
   PreferredDelimiters:
     "%":  ()
     "%i": ()

.ruby-version

@@ -1 +1 @@
-2.5.1
+2.6.10

Gemfile.lock

@@ -101,9 +101,9 @@ DEPENDENCIES
   pry
   rake (~> 10.0)
   rspec (~> 3.4)
-  rubocop (= 1.28.2)
+  rubocop
   simplecov
   yard
 
 BUNDLED WITH
-   1.17.1
+   1.17.2

android_apk.gemspec

@@ -13,7 +13,7 @@ Gem::Specification.new do |spec|
   spec.summary = "Android APK file analyzer"
   spec.homepage = "https://github.com/DeployGate/android_apk"
   spec.license = "MIT"
-  spec.required_ruby_version = ">= 2.5.0"
+  spec.required_ruby_version = ">= 2.6.0"
 
   spec.files = `git ls-files | grep -v 'spec/fixture'`.split($/)
   spec.test_files = spec.files.grep(%r{^(test|spec)/})
@@ -32,7 +32,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "simplecov"
 
   # Linting code and docs
-  spec.add_development_dependency "rubocop", "= 1.28.2" # latest of ruby 2.5 support
+  spec.add_development_dependency "rubocop"
   spec.add_development_dependency "yard"
 
   # Makes testing easy via `bundle exec guard`