Upgrade core-ktx library

app/build.gradle

@@ -103,7 +103,7 @@ dependencies {
 
     // Android
     implementation 'androidx.appcompat:appcompat:1.0.2'
-    implementation 'androidx.core:core-ktx:1.2.0-alpha03'
+    implementation 'androidx.core:core-ktx:1.3.0-alpha02'
     implementation 'com.google.android.material:material:1.0.0'
     implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
     implementation 'androidx.lifecycle:lifecycle-extensions:2.0.0'