Fix incorrect version for silent mutation dispatch

Author: blake-newman

docs/en/mutations.md

@@ -69,7 +69,7 @@ mutations: {
 
 ### Silent Dispatch
 
-> requires >=0.7.0
+> requires >=0.6.3
 
 In some scenarios you may not want the middlewares to record the state change. Multiple dispatches to the store in a short period or polled do not always need to be tracked. In these situations is may be considered appropriate to silent the mutations.