humanized_id.gemspec in humanized_id-0.1.0 vs humanized_id.gemspec in humanized_id-0.2.0

@@ -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 'humanized_id/version'
 
@@ -22,14 +23,13 @@
                        .reject { |f| f.match(%r{^(test|spec|features)/}) }
   spec.bindir        = 'exe'
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
 
-  spec.required_ruby_version = '>= 2.0'
+  spec.required_ruby_version = '>= 2.1'
 
   spec.add_development_dependency 'bundler'
   spec.add_development_dependency 'rake'
-  spec.add_development_dependency 'dotenv'
   spec.add_development_dependency 'rspec'
   spec.add_development_dependency 'simplecov'
   spec.add_development_dependency 'simplecov-rcov'
   spec.add_development_dependency 'coveralls'
   spec.add_development_dependency 'rubocop'