Remove bundler version constraint

Author: tom-lord

regexp-examples.gemspec

@@ -15,7 +15,7 @@ Gem::Specification.new do |s|
  s.require_paths = ['lib']
  s.homepage =
  'http://rubygems.org/gems/regexp-examples'
- s.add_development_dependency 'bundler', '~> 1.7'
+ s.add_development_dependency 'bundler'
  s.add_development_dependency 'rake', '~> 10.0'
  s.license = 'MIT'
  s.required_ruby_version = '>= 2.0.0'