prepare for release 0.5.1

Author: Dominiquini

README.md

@@ -16,7 +16,7 @@ Here is a quick video of it in action (click to see the full video):
 Download
 --------
 
-    compile 'com.github.smartcanvas:sticky-headers-recyclerview:0.5.0'
+    compile 'com.github.smartcanvas:sticky-headers-recyclerview:0.5.1'
 
 Usage
 -----

build.gradle

@@ -23,6 +23,6 @@ ext {
     buildToolsVersion = '22.0.1'
     targetSdkVersion = 22
     minSdkVersion = 14
-    versionCode = 12
-    versionName = "0.5.0"
+    versionCode = 13
+    versionName = "0.5.1"
 }