Fix the image file name
**Note:** This is a **read-only mirror** of the formal [Gerrit](https://gerrit.hyperledger.org/r/#/admin/projects/cello) repository. Find more details at [Cello Wiki](https://wiki.hyperledger.org/projects/cello).
-![Cello](docs/images/logo.png)
+![Cello](docs/images/favicon.png)
Hyperledger Cello is a blockchain provision and operation system, which helps manage blockchain networks in an efficient way.
