Merge pull request bregman-arie#39 from obbap1/patch-1

Minor spelling fix

README.md

@@ -147,7 +147,7 @@ In your answer you can mention one or more of the following:
 <details>
 <summary>Explain mutable vs. immutable infrastructure</summary><br><b>
 
-In mutable infrastructure paradigm, changes applied on top of the existing infrastructure and over time
+In mutable infrastructure paradigm, changes are applied on top of the existing infrastructure and over time
 the infrastructure builds up a history of changes. Ansible, Puppet and Chef are examples to tools which
 follow mutable infrastructure paradigm.