Update lib version + billing warning

app/build.gradle

@@ -72,7 +72,7 @@ dependencies {
 
     // Android
     implementation 'androidx.appcompat:appcompat:1.0.2'
-    implementation 'androidx.core:core-ktx:1.1.0-alpha05'
+    implementation 'androidx.core:core-ktx:1.2.0-alpha01'
     implementation 'com.google.android.material:material:1.0.0'
     implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
     implementation 'androidx.lifecycle:lifecycle-extensions:2.0.0'
@@ -88,13 +88,15 @@ dependencies {
     implementation 'com.google.android.libraries.places:places:1.1.0'
 
     // Billing / Subscriptions
+    // WARNING FOR 2.0: https://developer.android.com/google/play/billing/billing_library_releases_notes
+    // Purchases MUST BE ACKNOWLEDGED
     implementation 'com.android.billingclient:billing:1.2.2'
 
     // Firebase
-    implementation 'com.google.firebase:firebase-core:16.0.8'
+    implementation 'com.google.firebase:firebase-core:16.0.9'
 
     // Crashlytics
-    implementation 'com.crashlytics.sdk.android:crashlytics:2.9.9'
+    implementation 'com.crashlytics.sdk.android:crashlytics:2.10.1'
 
     // Logs
     implementation 'com.jakewharton.timber:timber:4.7.1'