Bump gradle version

Reviewers: #kde_connect, philipc

Reviewed By: #kde_connect, philipc

Subscribers: philipc, #kde_connect

Tags: #kde_connect

Differential Revision: https://phabricator.kde.org/D12501

build.gradle

@@ -4,14 +4,14 @@ buildscript {
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.0.1'
+        classpath 'com.android.tools.build:gradle:3.1.0'
     }
 }
 
 apply plugin: 'com.android.application'
 
 android {
-    buildToolsVersion '26.0.2'
+    buildToolsVersion '27.0.3'
     compileSdkVersion 25
     defaultConfig {
         minSdkVersion 9