Update README.md

Prerequisites php version
lukascivil · Jan 2, 2018 · 204f874 · 204f874
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@@ -17,6 +17,9 @@ TreeWalker is a simple and small Library that will help you to work faster with
 ### Version
 0.8
 
+### Prerequisites
+* PHP >= 5.5
+
 ## Installation
 
 ### Using composer