Begin development on 6.2.1

Change-Id: I76d46ece278b24b656836b0fdb56923d5c93966e

Author: samtstern

buildSrc/src/main/kotlin/Config.kt

@@ -1,5 +1,5 @@
 object Config {
-    const val version = "6.2.0"
+    const val version = "6.2.1-SNAPSHOT"
     val submodules = listOf("auth", "common", "firestore", "database", "storage")
 
     private const val kotlinVersion = "1.3.10"