message: fix(gql): commitUpdate return type
diff: @@ -59,7 +59,7 @@ extend type Mutation {
  branchUpdate( branch: BranchUpdateInput! ): Boolean!
  branchDelete( branch: BranchDeleteInput! ): Boolean!
  commitCreate( commit: CommitCreateInput! ): String!
  - commitUpdate( commit: CommitUpdateInput! ): String!
  + commitUpdate( commit: CommitUpdateInput! ): Boolean!
  commitDelete( commit: CommitDeleteInput! ): Boolean!
  }
  