add bqwriter to the list of Third-Party APIs
add bqwriter to the list of Third-Party APIs

The library is currently on `v0.6.0` and is already used in production for several
products by OTA-Insight. We aim to have to be on a stable version in the near future.
In order to do so we are waiting on:

- the stabilisation of the Storage API used for one of three possible clients under the hood;
- opt-in data write error handling with managed retry: decide whether we want it or not, and if so, lock this into the API;
theckman/awesome-go,sadlil/awesome-go,avelino/awesome-go,jmelfi/awesome-go,pconcepcion/awesome-go