Overloaded function "on" with "succeeded" event must contains "result: any" in the interface "Job" 

Please, change 
from 
```typescript
interface Job {
...
on(ev: "succeeded", fn: (err: Error) => void): this;
```
to
```typescript
interface Job {
...
on(ev: "succeeded", fn: (result: any) => void): this;
```
Generics would work properly.