Updated version in README.

README.md

@@ -24,7 +24,7 @@ Easily reference the library in your Android projects using this dependency in y
 
 ```Gradle
 dependencies {
-    compile 'com.afollestad:material-dialogs:0.7.2.1'
+    compile 'com.afollestad:material-dialogs:0.7.2.2'
 }
 ```