TypeScript 2.7 breaks cli

[arahansen]

the typescriptPrettify module depends on the typescript.formatter.RulesProvider it seems this was removed in a recent release of TypeScript.

Since the CLI pulls this module in, I'm not able to use it on gql2ts@1.4.0

language-typescript declares its typescript depdency as ^2.2.2 which means it will automatically install 2.7.

I think the version needs to be locked to 2.2.2 (ie, no ^ in the dependency), or the prettifier should be updated to 2.7.

Alternatively, lock typescript to the last working version which seems to be 2.6

[brettjurgens]

that's not good, i'll lock the version down in the meantime while figuring out the path forward

[brettjurgens]

@arahansen i've just published version 1.4.1. would you mind trying and seeing if it fixes this issue?

[brettjurgens]

opened #133 to further the discussion about how to proceed

[arahansen]

Changes look good on 1.4.1. Thanks for the fix!