prepare to release 1.0.0

.travis.yml

@@ -1,5 +1,7 @@
 sudo: false
 language: ruby
 rvm:
+  - 2.3.5
+  - 2.4.2
   - ruby-head
 before_install: gem install bundler

README.md

@@ -1,5 +1,7 @@
 # Zlib
 
+[![Build Status](https://travis-ci.org/ruby/zlib.svg?branch=master)](https://travis-ci.org/ruby/zlib)
+
 This module provides access to the {zlib library}[http://zlib.net]. Zlib is designed to be a portable, free, general-purpose, legally unencumbered -- that is, not covered by any patents -- lossless data-compression library for use on virtually any computer hardware and operating system.
 
 The zlib compression library provides in-memory compression and decompression functions, including integrity checks of the uncompressed data.

zlib.gemspec

@@ -2,8 +2,8 @@
 # frozen_string_literal: true
 Gem::Specification.new do |spec|
   spec.name          = "zlib"
-  spec.version       = "0.1.0"
-  spec.date          = '2017-09-13'
+  spec.version       = "1.0.0"
+  spec.date          = '2017-12-11'
   spec.authors       = ["Yukihiro Matsumoto", "UENO Katsuhiro"]
   spec.email         = ["[email protected]", nil]
 
@@ -17,7 +17,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
   spec.extensions    = "ext/zlib/extconf.rb"
-  spec.required_ruby_version = ">= 2.5.0dev"
+  spec.required_ruby_version = ">= 2.3.0"
 
   spec.add_development_dependency "bundler"
   spec.add_development_dependency "rake"