Updated gradle and readme

Author: ahulr

README.md

@@ -26,7 +26,6 @@ Add this in your applications AndroidManifest.xml
 
 ###Gradle
 Just use it as a dependency in your app's build.gradle file
-*(will be available shortly)*
 
 ```groovy
 dependencies {

build.gradle

@@ -5,7 +5,7 @@ buildscript {
  jcenter()
  }
  dependencies {
- classpath 'com.android.tools.build:gradle:2.1.3'
+ classpath 'com.android.tools.build:gradle:2.2.2'
  //classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.6'
  classpath 'com.github.dcendents:android-maven-gradle-plugin:1.4.1'
  // NOTE: Do not place your application dependencies here; they belong