Update Travis CI configuration

.travis.yml

@@ -1,5 +1,11 @@
 sudo: false
 language: ruby
 rvm:
+ - 2.1
+ - 2.2
  - 2.3.1
-before_install: gem install bundler -v 1.12.5
+before_install:
+ - gem install bundler
+notifications:
+ slack:
+ secure: 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

README.md

@@ -1,8 +1,8 @@
 # Hanreki
 
-Simple schedule manager for [CAMPHOR-](https://camph.net/)
+[![Build Status](https://travis-ci.org/camphor-/hanreki.svg?branch=master)](https://travis-ci.org/camphor-/hanreki)
 
-TODO: Delete this and the text above, and describe your gem
+Simple schedule manager for [CAMPHOR-](https://camph.net/)
 
 ## Installation
 ### Gem