"sqlite3-ruby" had been renamed to "sqlite3"

The library name "sqlite3-ruby" had been renamed to "sqlite3". We should replace from "sqlite3-ruby" to "sqlite3" on our own RubyGems.

If your platform is MinGW(Windows) like this enrty, please check below:

> gem uninstall sqlite3-ruby
> gem install sqlite3 --platform=ruby -- --with-sqlite3-dir=C:/sqlite3