Don't require path in UseGraphiQl to be absolute

[FrankyBoy]

Hi!

TL;DR: we are hosting in a subdirectory (to separate different API versions). Right now we have to call https://github.com/JosephWoodward/graphiql-dotnet/blob/6ff32fb21be3fb30c981d3d0e1dcff06e03811ff/src/graphiql/GraphiQlExtensions.cs#L16 with an absolute path, meaning we have to know the subdirectory we are hosted under. I would argue removing the check on this line https://github.com/JosephWoodward/graphiql-dotnet/blob/6ff32fb21be3fb30c981d3d0e1dcff06e03811ff/src/graphiql/GraphiQlExtensions.cs#L21 does not hurt anyone and gives more flexibility.

Cheers,
FB

[josephwoodward]

Sounds like a good idea, if you want to create a PR for your proposed fix then I can get it merged. I'll be doing a release in the next few days which also includes #15.

[FrankyBoy]

Cool. Great news. Created a PR (#22) I hope that works out alright.

[josephwoodward]

Thanks!

[srini85]

Thanks guys. Great progress