Bump version to v0.3.21

Author: alinz

README.md

@@ -28,13 +28,13 @@
 to install sdk
 
 ```shell
-go get ella.to/bus@v0.3.18
+go get ella.to/bus@v0.3.21
 ```
 
 to install a cli, run the following
 
 ```shell
-go install ella.to/bus/cmd/bus@v0.3.18
+go install ella.to/bus/cmd/bus@v0.3.21
 ```
 
 and to run the server using docker, simply use the provided docker-compose and run it

bus.go

@@ -15,7 +15,7 @@ import (
 
 var (
 	// these variables are set during build time
-	Version   = "v0.3.18"
+	Version   = "v0.3.21"
 	GitCommit = ""
 	// the following variables are used in the project
 	msgType   = "msg"