Tweeted Images need Alt Text

[VickiLanger]

Describe the bug
Images being tweeted do not have alt text. Alt text is imperative for making tweets accessible to everyone.

Reference on why alt text is so important

Additional context
Resources that may be helpful:

• https://iq.opengenus.org/post-image-twitter-api/
• http://docs.tweepy.org/en/latest/api.html#API.create_media_metadata

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