Move to 12.0.01

Change-Id: Iab4ecc8d89295158b810a7a9323c05ecad7a5efa

Author: samtstern

constants.gradle

@@ -8,7 +8,7 @@ project.ext {
     targetSdk = 27
     minSdk = 14
 
-    firebaseVersion = '12.0.0'
+    firebaseVersion = '12.0.1'
     supportLibraryVersion = '27.1.0'
     architectureVersion = '1.1.0'
     kotlinVersion = '1.2.30'