fix readme

Author: taobun

packages/cw-band/README.md

@@ -1,6 +1,7 @@
 # cw-band
 
-[![cw-band on crates.io](https://img.shields.io/crates/v/cw-band.svg)](https://crates.io/crates/cw-band
+[![cw-band on crates.io](https://img.shields.io/crates/v/cw-band.svg)](https://crates.io/crates/cw-band)
+
 The helper library for building CosmWasm smart contracts to interact with Bandchain. Code in this package
 is compiled into the smart contract.