Merge pull request #69 from maxbbraun/dependabot/pip/lxml-4.6.5

Bump lxml from 4.6.2 to 4.6.5

Fix missing newline at end of file

Only check sentiment once per tweet

Downgrade google-cloud-logging version

Remove shell symbol for easier copying

Use single quote style consistently

Upgrade library dependencies

Fix and add some more analysis tests

Harden Polygon API requests against rate limits

Handle errors from looking up missing tweets

Add support for cryptocurrencies

Add MIT license

Remove Apache license

Switch to Polygon API for benchmark