Add standard gems as dev dependencies

Author: janlelis

spec/tokenizer_number_spec.rb

@@ -1,5 +1,3 @@
-require 'complex'
-
 describe tokenizer(__FILE__) do
   after :each do check_value end
 

wirb.gemspec

@@ -7,8 +7,8 @@ Gem::Specification.new do |s|
   s.authors     = ["Jan Lelis"]
   s.email       = ["hi@ruby.consulting"]
   s.homepage    = "https://github.com/janlelis/wirb"
-  s.summary     = "WIRB Interactive Ruby"
-  s.description =  "WIRB syntax highlights inspected Ruby objects"
+  s.summary     = "Add syntax highlighting for inspected Ruby objects"
+  s.description =  "WIRB adds syntax highlighting for inspected Ruby objects - from core and default gems"
   s.files = Dir.glob(%w[{lib,test,spec}/**/*.rb bin/* [A-Z]*.{txt,md} ext/**/*.{rb,c} data/**/*.yml]) + %w{Rakefile wirb.gemspec}
   s.extra_rdoc_files = ["README.md", "CHANGELOG.md", "COPYING.txt"]
   s.license     = 'MIT'
@@ -17,6 +17,11 @@ Gem::Specification.new do |s|
   s.add_dependency 'paint', '>= 0.9', '< 4.0'
   s.add_development_dependency 'rspec', '~> 3.13'
   s.add_development_dependency 'diff-lcs', '~> 1.6'
-  s.add_development_dependency 'rake', '~> 13.0'
+  s.add_development_dependency 'rake', '~> 13.2'
   s.add_development_dependency 'ruby_engine', '~> 2.0'
+  s.add_development_dependency 'ostruct'
+  s.add_development_dependency 'fileutils'
+  s.add_development_dependency 'irb'
+  s.add_development_dependency 'stringio'
+  s.add_development_dependency 'date'
 end