update README

Author: novi

README.md

@@ -70,9 +70,11 @@ Install pkg-config `.pc` file in [cmysql](https://github.com/vapor-community/cmy
 
 ```sh
 # cmysql
-$ brew install https://gist.githubusercontent.com/novi/c6d4afa6e9f9cc9c426e3ccd140c3c74/raw/7130ad1d5062cdb2f7492d42e8d5574b864f3e18/cmysql.rb
+$ brew tap novi/tap
+$ brew install novi/tap/cmysql
 # cmysql-mariadb
-$ brew install https://gist.githubusercontent.com/novi/dd21d48d260379e8919d9490bf5cfaec/raw/6ea4daa02d93f4ab0110ad30d87ea2b497a71cd0/cmysqlmariadb.rb
+$ brew tap novi/tap
+$ brew install novi/tap/cmysqlmariadb
 ```
 
 ## Ubuntu