api key request works only once.

[blu2ego]

Hi,
Thank you for your awesome package!
But, I have experienced a problem for applying api key.
As you know, when I run analyze_sentiment() function after installing this package, this function request user's google api key. But, although I do not enter the key at the first time, this package do not request the key again.
Finally, I can't get permission to use google api ever.
This phenomenon is represented although remove and install this package.
Could you fix this bug?
Thank you so much!