Make readme aligned again

Author: pamil

README.md

@@ -2,7 +2,7 @@
     <img src="https://avatars2.githubusercontent.com/u/20600343" /><br/>
 </p>
 
-<h1>SymfonyExtension</h1>
+<h1 align="center">SymfonyExtension</h1>
 
 <p align="center">Integrates Behat with Symfony (`^3.4` and `^4.1`).</p>