Changes to Query fund holdings in two directions. Provide exactly one of `ticker` or `holding`. `?ticker=SPY` returns a fund's constituents and each position's weight (the fund's latest filing by default, or the composition in effect on/before `as_of`). `?holding=AAPL` returns the funds whose latest filing holds that security, sorted by weight.

added the new optional query request parameter as_of

added the new optional query request parameter asset_class

added the new optional query request parameter cursor

added the new optional query request parameter holding

added the new optional query request parameter limit

added the new optional query request parameter offset

added the new optional query request parameter ticker

endpoint added