pick_by has different behaviour with lodash.pickBy

[cnwangjie]

In [1]: import pydash

In [2]: pydash.pick_by({'a': 1, 'b': 0})
Out[2]: {}

In [3]: pydash.pick_by({'a': 1, 'b': 0}, lambda i: i)
Out[3]: {'a': 1}

Expected behaviour: pydash.pick_by({'a': 1, 'b': 0}) will return {'a': 1}

Actual behaviour: return {}

Following is the behaviour in Lodash

> _.pickBy({a: 1, b: 0})
< {a: 1}

[slallum]

duplicate of #129, closed by #139 :)

[cnwangjie]

Thanks