Fix IntrospectionQuery when use non-GET methods

[varavut]

Hello,

I have try to use elm-graphql with Apollo Server that require to use only POST method and I found some problems and try to fix as below.

1. options.method and options.schema is not pass to the config object.

• add them to elmPackageJson.graphql instead elmPackageJson because the config object wull read from elmPackageJson.graphql.
  2) encode body with JSON.stringify is not work
• use the json: true option and set body object to body property directly.
  3) In my app there are some custon scalar types such as Date that will make unexpected type error
• log the error instead throw an error then a user will can fix elm code manually.

Thank you for your work.

[ldesgoui]

Had the same problem, this fixed it for me

[anagrius]

@jahewson Is this project dead, or is it safe to use?

[jahewson]

@anagrius, it's safe to use - sorry I've been crazy busy but I will be merging PRs and fixing bugs soon.

[ghost]

Really looking forward to using this with POST-only server + Elm 0.18

[wpcarro]

@jahewson this would be very helpful with Absinthe (Elixir's GraphQL library). Could you merge please?

[ronanyeah]

Any news on this?