Fixed some typos in errors

ref #76

src/errors/RunnerErrors.ts

@@ -32,5 +32,5 @@ export class RunnerGroupNeededError extends NotAcceptableError {
 	name = "RunnerGroupNeededError"
 
 	@IsString()
-	message = "Runner's need to be part of one group (team or organisiation)! \n You provided neither."
+	message = "Runner's need to be part of one group (team or organisation)! \n You provided neither."
 }