mruby-set/README.md: more cleanup after
-# mruby-set [![Build Status](https://travis-ci.org/yui-knk/mruby-set.png?branch=master)](https://travis-ci.org/yui-knk/mruby-set)
+# mruby-set
Set class
-## Install by mrbgems
-
-- add conf.gem line to `build_config.rb`
-
-```ruby
-MRuby::Build.new do |conf|
-
- # ... (snip) ...
-
- conf.gem :git => 'https://github.com/yui-knk/mruby-set.git'
-end
-```
-
## Example
```ruby
