revert sdk upgrade

app/build.gradle

@@ -2,6 +2,7 @@ apply plugin: 'com.android.application'
 
 android {
     compileSdkVersion 27
+    buildToolsVersion '27.0.3'
 
     defaultConfig {
         applicationId "org.schabi.newpipe"

build.gradle

@@ -6,7 +6,7 @@ buildscript {
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.2.0'
+        classpath 'com.android.tools.build:gradle:3.1.4'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files