[ci skip] Update docs

docs/docs/installation.md

@@ -8,6 +8,7 @@ $ npm install --save pg
 $ npm install --save mysql
 $ npm install --save mariasql
 $ npm install --save sqlite3
+$ npm install --save tedious // MSSQL
 ```
 
 ## Setting up a connection
@@ -24,4 +25,4 @@ var sequelize = new Sequelize('database', 'username', 'password', {
 var sequelize = new Sequelize('postgress://user:pass@example.com:5432/dbname');
 ```
 
-The Sequelize constructor takes a whole slew of options that are available via the [API reference](http://sequelize.readthedocs.org/en/latest/api/sequelize/).
\ No newline at end of file
+The Sequelize constructor takes a whole slew of options that are available via the [API reference](http://sequelize.readthedocs.org/en/latest/api/sequelize/).