depricarting "YoutubeDataApi" in favor of "YouTubeDataAPI"

[yinleon]

As of v.0.0.21, we're depricating the class "YoutubeDataApi" in favor of "YouTubeDataAPI". These classes are functionally equivalent!

[Benjamin-Loison]

Note that the About of this repository seems affected:

A Python Client for collect and parse public data from the Youtube Data API

Source: https://github.com/SMAPPNYU/youtube-data-api