Updated version in README.

README.md

@@ -23,7 +23,7 @@ Easily reference the library in your Android projects using this dependency in y
 
 ```Gradle
 dependencies {
-    compile 'com.afollestad:material-dialogs:0.6.5.2'
+    compile 'com.afollestad:material-dialogs:0.6.6.0'
 }
 ```