Return type annotation for parser.parse is not correct

[chaoflow]

• I am on the latest Pendulum version.

• I have searched the issues of this repo and believe that this is not a duplicate.

• OS version and name:

• https://github.com/sdispater/pendulum/tree/205a86a22cbebd1fb33c5332a05fa9c2da5a3763

Issue

https://github.com/sdispater/pendulum/blob/205a86a22cbebd1fb33c5332a05fa9c2da5a3763/pendulum/parser.py#L19 indicates that str is to be returned which is not true. I think this should either be Any or a subtype of what is actually returned.