Update README.md

Author: johnsonlee

README.md

@@ -73,7 +73,7 @@ The best practise of using Booster is integrating the specific module to solve t
 
 ```groovy
 buildscript {
-    ext.booster_version = '3.2.0'
+    ext.booster_version = '3.3.0'
     repositories {
         google()
         mavenCentral()