Update Readme.md. Fix commas. (#479)

Readme.md

@@ -310,12 +310,12 @@ Additionally, `customPrettifiers` can be used to format the `time`, `hostname`,
  // The argument for the level-prettifier may vary depending
  // on if the levelKey option is used or not.
  // By default this will be the same numerics as the Pino default:
- level: logLevel => `LEVEL: ${logLevel}`
+ level: logLevel => `LEVEL: ${logLevel}`,
 
  // other prettifiers can be used for the other keys if needed, for example
- hostname: hostname => colorGreen(hostname)
- pid: pid => colorRed(pid)
- name: name => colorBlue(name)
+ hostname: hostname => colorGreen(hostname),
+ pid: pid => colorRed(pid),
+ name: name => colorBlue(name),
  caller: caller => colorCyan(caller)
  }
 }