Install sqlite3 Ruby gem with homebrew's version of sqlite

Writing it down here, so that I don't have to look for it every single sqlite update.

gem install sqlite3 -- --with-sqlite3-include=/usr/local/Cellar/sqlite/3.8.10.1/include --with-sqlite3-lib=/usr/local/Cellar/sqlite/3.8.10.1/lib

Replace 3.8.10.1 with the actual version of sqlite.