Support for the new Alpaca data API
In this release, we support the Alpaca data API: https://alpaca.markets/docs/api-documentation/api-v2/
- updated the minimum Alpaca SDK to 0.48
- added usePolygon flag to indicate weather the user wants alpaca data or polygon data. default is alpaca
- improvments to the cli:
- can select log timezone
- description for shell and run