Change rake tasks to improve formatting

Rakefile

@@ -1,12 +1,12 @@
-# encoding: utf-8
+# frozen_string_literal: true
 
 require "bundler/gem_tasks"
 
-FileList['tasks/**/*.rake'].each(&method(:import))
+FileList["tasks/**/*.rake"].each(&method(:import))
 
-mri = RUBY_ENGINE == 'ruby'
-specs = ['spec']
-specs.unshift('spec:perf') if mri
+mri = RUBY_ENGINE == "ruby"
+specs = ["spec"]
+specs.unshift("spec:perf") if mri
 
-desc 'Run all specs'
+desc "Run all specs"
 task ci: specs

tasks/console.rake

@@ -4,8 +4,8 @@ desc "Load gem inside irb console"
 task :console do
   require "irb"
   require "irb/completion"
-  require File.join(__FILE__, "../../lib/finite_machine")
+  require_relative "../lib/finite_machine"
   ARGV.clear
   IRB.start
 end
-task :c => :console
+task c: :console

tasks/spec.rake

@@ -24,11 +24,10 @@ begin
       task.pattern = "spec/performance{,/*/**}/*_spec.rb"
     end
   end
-
 rescue LoadError
   %w[spec spec:unit spec:integration].each do |name|
     task name do
-      $stderr.puts "In order to run #{name}, do `gem install rspec`"
+      warn "In order to run #{name}, do `gem install rspec`"
     end
   end
 end