Specify that mysql package is used for both mysql and mariadb dialects

docs/docs/getting-started.md

@@ -7,8 +7,7 @@ $ npm install --save sequelize
 
 # And one of the following:
 $ npm install --save pg pg-hstore
-$ npm install --save mysql
-$ npm install --save mariasql
+$ npm install --save mysql // For both mysql and mariadb dialects
 $ npm install --save sqlite3
 $ npm install --save tedious // MSSQL
 ```