zser.gemspec in zser-0.0.0 vs zser.gemspec in zser-0.0.1

@@ -1,6 +1,8 @@
-# coding: utf-8
+# encoding: utf-8
+# frozen_string_literal: true
+
 lib = File.expand_path("../lib", __FILE__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require "zser/version"
 
 Gem::Specification.new do |spec|
@@ -14,9 +16,9 @@
   spec.files         = `git ls-files -z`.split("\x0").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 = ">= 2.2.2"
 
   spec.add_development_dependency "bundler", "~> 1.14"
 end