Fix JitPack build error

Fix JitPack build error Could not find com.android.tools.build:gradle:3.0.1 by adding the google() repository to buildscript.

Author: pedro-jorge-pereira

build.gradle

@@ -2,6 +2,7 @@ buildscript {
 	ext.kotlin_version = '1.2.21'
     repositories {
         jcenter()
+	google()
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:3.0.1'
@@ -28,4 +29,4 @@ ext {
     buildToolsVersion = "27.0.2"
     versionCode = 6
     versionName = '0.2.4'
-}
+}