windcharger.gemspec in windcharger-0.3.0 vs windcharger.gemspec in windcharger-0.4.0

@@ -1,6 +1,7 @@
-# coding: utf-8
+# frozen_string_literal: true
+
 lib = File.expand_path('../lib', __FILE__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require 'windcharger/version'
 
 Gem::Specification.new do |spec|
@@ -16,9 +17,9 @@
   spec.files         = `git ls-files`.split($/)
   spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ['lib']
 
-  spec.add_development_dependency 'bundler', '~> 1.3'
+  spec.add_development_dependency 'bundler', '>= 1.3', '< 3.0'
   spec.add_development_dependency 'rake'
   spec.add_development_dependency 'rspec'
 end