Requesting a few additional datapoints from the Income Statement that Yahoo Query cannot currently pull.

**Is your feature request related to a problem? Please describe.**
Hello, I was hoping that somebody could add the following 3 indicators in the response of calls to p_income_statement for a given Ticker: gross profit margin, gross income growth, and net margin growth

**Describe the solution you'd like**
I would be very appreciative if yahooquery could be updated to include functionality for pulling those 3 data points

**Describe alternatives you've considered**
I tried adding them myself but manipulating the source code for yahoo query is still above my head in terms of code complexity

**Additional context**
Add any other context or screenshots about the feature request here.