Resolve below comments from stackoverflow

(FWIW, looking through the code I don't see any point where you would filter for functions specifically to begin with.)

Erm, okay. Apparently that's because it actually doesn't. It just looks up names in modules, no matter the underlying type.

```py
>>> pylibfinder.find_similar('int', 0.9)
[{'Module': 'builtins', 'Function': 'int', 'Score': 1.0}]
>>> pylibfinder.find_similar('True', 0.9)
[{'Module': 'builtins', 'Function': 'True', 'Score': 1.0}]
```

I also seem to be getting duplicates. These are all the same object, and one of its aliases is reported twice.

```py
>>> pylibfinder.find_similar('pathsep', 0.9)
[{'Module': 'posixpath', 'Function': 'pathsep', 'Score': 1.0}, {'Module': 'posixpath', 'Function': 'pathsep', 'Score': 1.0}, {'Module': 'os', 'Function': 'pathsep', 'Score': 1.0}]
```