Update README.md - Fix #175

[christianpv]

I updated the documentation regarding current spec implementation.

[coveralls]

Coverage remained the same at 82.605% when pulling fd19735 on christianpv:patch-1 into 170c5b5 on graphql-go:master.

[bbuck]

I see you added details about where graphql-js is in relation to the spec and where the spec is but did you update where this project is currently at?

[christianpv]

I believe I did. This is a part of the update to README.md: graphql is currently on v0.6.0 of graphql-js.
If this is not what you mean, could you elaborate? Thanks!

[bbuck]

Ahh, if hmm. That was the confusion you said "graphql is currently ..." I think we should probably use some other language, like "this project" or "Go implementation" or just "graphql-go" (just to set it a part from every other usage of graphql in that paragraph. Already seeing a few users hopping over to the clearly labeled graphql-go gitter channel and asking for help with graphql-js so I know this can confuse others.

[coveralls]

Coverage decreased (-0.02%) to 82.585% when pulling a915771 on christianpv:patch-1 into 170c5b5 on graphql-go:master.

[chris-ramon]

LGTM 👍 - thanks a lot @christianpv