style: add rubocop to enforce very basic codestyle conventions

.rubocop.yml

@@ -0,0 +1,18 @@
+AllCops:
+ TargetRubyVersion: 2.5
+ DisabledByDefault: true
+
+Bundler:
+ Enabled: true
+
+Gemspec:
+ Enabled: true
+
+Layout:
+ Enabled: true
+
+Performance:
+ Enabled: true
+
+Security:
+ Enabled: true

Gemfile

@@ -1,6 +1,6 @@
 source "https://rubygems.org"
 
-git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
+git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }
 
 # Specify your gem's dependencies in webauthn.gemspec
 gemspec

webauthn.gemspec

@@ -18,7 +18,7 @@ Gem::Specification.new do |spec|
  "source_code_uri" => "https://github.com/cedarcode/webauthn-ruby"
  }
 
- spec.files  = `git ls-files -z`.split("\x0").reject do |f|
+ spec.files = `git ls-files -z`.split("\x0").reject do |f|
  f.match(%r{^(test|spec|features)/})
  end
  spec.bindir = "exe"
@@ -31,4 +31,5 @@ Gem::Specification.new do |spec|
  spec.add_development_dependency "byebug", "~> 10.0"
  spec.add_development_dependency "rake", "~> 10.0"
  spec.add_development_dependency "rspec", "~> 3.0"
+ spec.add_development_dependency "rubocop", "0.56.0"
 end