RuboCop 0.36 fixups

Gemfile

@@ -1,7 +1,15 @@
 source "https://rubygems.org"
 
+gemspec
+
 gem "jruby-openssl" if defined? JRUBY_VERSION
-gem "coveralls", require: false
 
-# Specify your gem's dependencies in nio4r.gemspec
-gemspec
+group :development do
+  gem "rake-compiler"
+end
+
+group :test do
+  gem "rspec",     "~> 3.0"
+  gem "rubocop",   "0.36.0"
+  gem "coveralls", require: false
+end

lib/nio.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "thread"
 require "socket"
 require "nio/version"
@@ -16,16 +18,16 @@ def self.engine
 if ENV["NIO4R_PURE"] == "true" || (Gem.win_platform? && !defined?(JRUBY_VERSION))
   require "nio/monitor"
   require "nio/selector"
-  NIO::ENGINE = "ruby"
+  NIO::ENGINE = "ruby".freeze
 else
   require "nio4r_ext"
 
   if defined?(JRUBY_VERSION)
     require "java"
     require "jruby"
     org.nio4r.Nio4r.new.load(JRuby.runtime, false)
-    NIO::ENGINE = "java"
+    NIO::ENGINE = "java".freeze
   else
-    NIO::ENGINE = "libev"
+    NIO::ENGINE = "libev".freeze
   end
 end

lib/nio/monitor.rb

@@ -39,7 +39,7 @@ def readable?
     def writable?
       readiness == :w || readiness == :rw
     end
-    alias_method :writeable?, :writable?
+    alias writeable? writable?
 
     # Is this monitor closed?
     def closed?

lib/nio/selector.rb

@@ -78,11 +78,7 @@ def select(timeout = nil)
 
         ready_writers.each do |io|
           monitor = @selectables[io]
-          if monitor.readiness == :r
-            monitor.readiness = :rw
-          else
-            monitor.readiness = :w
-          end
+          monitor.readiness = (monitor.readiness == :r) ? :rw : :w
           selected_monitors << monitor
         end
 

lib/nio/version.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module NIO
-  VERSION = "1.2.0"
+  VERSION = "1.2.0".freeze
 end

nio4r.gemspec

@@ -23,8 +23,6 @@ Gem::Specification.new do |gem|
     gem.extensions = ["ext/nio4r/extconf.rb"]
   end
 
-  gem.add_development_dependency "rake-compiler"
   gem.add_development_dependency "rake"
-  gem.add_development_dependency "rspec", "~> 3.0"
-  gem.add_development_dependency "rubocop"
+  gem.add_development_dependency "bundler"
 end