update build tools and kotlin

app/build.gradle

@@ -14,7 +14,6 @@ def getGitSha = { ->
 
 android {
     compileSdkVersion 28
-    buildToolsVersion '28.0.2'
     defaultConfig {
         applicationId "com.keylesspalace.tusky"
         minSdkVersion 21

build.gradle

@@ -1,13 +1,13 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
-    ext.kotlin_version = '1.2.60'
+    ext.kotlin_version = '1.2.71'
     repositories {
         jcenter()
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.2.0'
+        classpath 'com.android.tools.build:gradle:3.2.1'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }