Remove promise return from poolConnection release and destroy as mysq…

…ljs doesn't take a callback. Closes #77

README.md

@@ -176,6 +176,11 @@ Promise.using(getSqlConnection(), function(connection) {
 At the moment only simple basics tests are implemented using Mocha.
 To run the tests, you need to connect to a running MySQL server. A database or write permissions are not required.
 
+If you have docker, you can run a docker container bound to the mysql port with the command:
+```bash
+docker run -p 3306:3306 --name mysql_container -e MYSQL_ROOT_PASSWORD=password -d mysql
+```
+
 Start the test suite with
 
 ```bash

lib/poolConnection.js

@@ -11,11 +11,11 @@ var poolConnection = function(_connection) {
 inherits(poolConnection, Connection);
 
 poolConnection.prototype.release = function() {
-    return promiseCallback.apply(this.connection, ['release', arguments]);
+    this.connection.release();
 };
 
 poolConnection.prototype.destroy = function() {
-    return promiseCallback.apply(this.connection, ['destroy', arguments]);
+    this.connection.destroy();
 };
 
 module.exports = poolConnection;