Upgrade Android Studio

mobile/android/build.gradle

@@ -2,10 +2,11 @@
 
 buildscript {
     repositories {
+        google()
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.0.1'
+        classpath 'com.android.tools.build:gradle:3.1.0'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
@@ -27,7 +28,7 @@ ext {
     compileSdkVersion = 27
     targetSdkVersion = 27
     minSdkVersion = 24
-    buildToolsVersion = "26.0.2"
+    buildToolsVersion = "27.0.3"
     supportLibVersion = "25.3.1"
     googlePlayServicesVersion = "11.8.0"
     androidMapsUtilsVersion = "0.5+"