Fixed typo: 'biogude' -> 'bioguide'

Btw, on line 15 I think you wanted to say,

    We'll just try the top _6_ legislators

Thanks for creating this and I plan to use it soon
(just created my account/got my API key today!).
Merge pull request #2 from elimisteve/patch-1

Fixed typo: 'biogude' -> 'bioguide'