Uninformative error is raised when passing tuple of integers into rg.get

[allenlawrence94]

When using rg.get like so:

import reverse_geocoder as rg
rg.get((40, -80.5))

the following error is raised:

TypeError: Expecting a tuple

You can see here that this error is raised because the first element of geo_coord is not a float. This is very confusing behavior (especially considering rg.get((40.5, -80)) works perfectly fine) and the error message is not helpful.

I think this function should be able to handle all real numerical types (or at least float and int), and the error message should be improved.

I'll submit a PR for this soon unless anyone has any reasoning against this.