Context manager cannot be used with 'as'

[andy-maier]

I was trying to use the as clause along with the context manager abilities of the Spinner class in order to remember the Spinner object, because I want to temporarily suspend the spinner during a password prompt that may happen while executing the code that has the spinner turned on.

However, that resulted in a value of None in the name specified in the as clause.

For example:

with click_spinner.spinner() as sp:
    print(sp)

will print None.

Even if there is not much value currently in having the Spinner object at hand, I think it is part of the contract for a context manager to be able to support the `as´ clause.

Solution: Python uses the return value of the __enter__() method to bind the name specified in the as clause to. So in order to support the as clause, the __enter__() method of the Spinner class needs to return self.

[andy-maier]

Fixed in PR #2.