Add parenthesis after auto-completing methods

If I've a class A with `doSomething()` method defined on it and I do this -
```cpp
A a;
a.doSo
```
it pops up `doSomething` as autocompletion. If I select it, it completes the word to `a.doSomething`. Notice that `doSomething` isn't a member var but a member method so correct behaviour should be `a.doSomething()` with cursor in b/w the parenthesis.