SDL: fixed dark text on dark background in notification, updated Gradle files

project/build.gradle

@@ -1,15 +1,12 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
-
     repositories {
         google()
         jcenter()
-
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.6.2'
-
+        classpath "com.android.tools.build:gradle:4.0.0"
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
@@ -20,7 +17,6 @@ allprojects {
     repositories {
         google()
         jcenter()
-
     }
 }