Always show latest version in readme

Author: jacobtabak

README.md

@@ -16,7 +16,10 @@ Here is a quick video of it in action (click to see the full video):
 Download
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-    compile 'com.timehop.stickyheadersrecyclerview:library:0.4.3@aar'
+Current version: [![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.timehop.stickyheadersrecyclerview/library/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.timehop.stickyheadersrecyclerview/library)
+
+    compile 'com.timehop.stickyheadersrecyclerview:library:[latest.version.number]@aar'
+
 
 Usage
 -----