fixed maintainer github handle (#215)

Author: Ewelina Wilkosz

README.md

@@ -1,6 +1,6 @@
 [![Build Status](https://api.travis-ci.org/Praqma/JenkinsAsCodeReference.svg?branch=master)](https://travis-ci.org/Praqma/JenkinsAsCodeReference)
 ---
-maintainer: ewelinawilkosz2
+maintainer: ewelinawilkosz
 ---
 
 # Jenkins as Code template