Update content/microservices/redis.md

Co-authored-by: Jay McDoniel <[email protected]>

Author: kamilmysliwiec

content/microservices/redis.md

@@ -9,7 +9,7 @@ The [Redis](https://redis.io/) transporter implements the publish/subscribe mess
 To start building Redis-based microservices, first install the required package (note as of now the supported Redis version is ^3, not the latest ^4):
 
 ```bash
-$ npm i --save redis@3
+$ npm i --save redis@^3
 ```
 
 #### Overview