Pre-Market / After-Hours Data

**Is your feature request related to a problem? Please describe.**
I cannot seem to find how to get premarket and after-hours data, only regular hours. This feature will be great and improve the usability of the library a lot.

**Describe the solution you'd like**
Add pre-market and after-market data for each stock. Just like yfinance has prepost = True.

**Describe alternatives you've considered**
Nothing else to consider.

**Additional context**