Fix object in default tag

[miafoo]

This PR fixes 2 issues:

• Default generator crashing when using objects as defaults (see example below).
• Default spacing were inconsistent with everything else.

Example: In our API we've got something like:

users(
  query: String,
  orderBy: UserOrder = {field: creation_time, direction: ASC}
): [User!]!

However, using gql2ts breaks when trying to convert that, since orderBy is an object. This seems to fix it, although I'm not sure it's the best way to deal with it.

[coveralls]

Coverage increased (+0.02%) to 96.379% when pulling 5d20eff on mikfoo:master into fb1cb87 on avantcredit:master.

[miafoo]

Just noticed there's a PR for this already #186 although I guess this one also fixes the inconsistent default spacing.

[brettjurgens]

looks good! thanks for opening a PR

[brettjurgens]

can we use lowercase object?

[brettjurgens]

i think we should just JSON.stringify everything, that way strings are quoted as well. What do you think?

[miafoo]

I'm pretty indifferent about it. I guess the main disadvantage with it is that it all looks like strings now, even numbers (not counting objects which looks like objects).

[brettjurgens]

w/r/t spacing, it's recommended to run through Prettier (and language-typescript does this by default if installed). keeping track of spacing was a bit of a pain 😄

[miafoo]

@brettjurgens I've updated the PR with the requested changes as well as commented on the JSON.stringify - check #192 (comment)

[miafoo]

@brettjurgens awesome, can you make a new NPM release as well?