Some code improvements

* Some assignments simplified by using assignment operators
* Rewrite switch statement with only one case as if.
* Rewrite if-else chain as a switch statement.
* go fmt `modules/todoist/project.go` file.

modules/newrelic/widget.go

@@ -73,7 +73,7 @@ func (widget *Widget) contentFrom(deploys []nr.ApplicationDeployment) string {
 				revLen = len(deploy.Revision)
 			}
 
-			str = str + fmt.Sprintf(
+			str += fmt.Sprintf(
 				" [green]%s[%s] %s %-.16s[white]\n",
 				deploy.Revision[0:revLen],
 				lineColor,