Adjust README language for clarity
Adjust README language for clarity

"If you're not seeing any problems" could be confusing to some readers,
because of the double meaning of "problems": 1) Exercism problems (the
app domain meaning) and 2) problems with setting up the local dev
environment.

lfex/exercism-api,lfex/exercism-api,exercistas/x-api,jtigger/x-api,amar47shah/x-api,exercistas/x-api,exercism/x-api,yurrriq/x-api,yurrriq/x-api,amar47shah/x-api,exercism/x-api,jtigger/x-api