Start development on version 5.0.1

Change-Id: Ic01f3ad00447b7bca39cf6d586648f310cdb779a

Author: samtstern

buildSrc/src/main/kotlin/Config.kt

@@ -1,5 +1,5 @@
 object Config {
-    const val version = "5.0.0"
+    const val version = "5.0.1-SNAPSHOT"
     val submodules = listOf("auth", "auth-github", "common", "firestore", "database", "storage")
 
     private const val kotlinVersion = "1.2.61"