stripe-node v7.0.0 (stripe#606)

* Update version to 7 and drop support for Node 4 and Node 5, and Node 7

* Format using Prettier

tmp

* Alphabetize basic methods

* Use 'id' for all single identifier positional arguments

* Fix typo

* Modernize ES5 to ES6 with lebab (stripe#607)

* Add lebab and a script to run it

* lebab transform: arrow

* lebab transform: arg-rest

* lebab transform: arg-spread

* lebab transform: obj-method

* lebab transform: obj-shorthand

* lebab transform: let

* lebab transform: template

* lebab transform: default-param

* lebab transform: destruct-param

* lebab transform: includes

* Revert "Add lebab and a script to run it"

This reverts commit 70fd492.

* Revert "lebab transform: destruct-param" because its changes didn't seem good.

This  reverts commit b56f52d.

* Revert "lebab transform: default-param" because it seems dangerous / backwards-incompatible.

This reverts commit 7eba992.

* Unrelated: mark 8.1 as minimum 8-series version

* Add mocha-only script

* Use arrows in more places

* Loosen some eslint rules I don't love

* Remove deprecated methods

* Add VSCode and EditorConfig files

* Bump dependencies to latest versions

* Remove legacy parameter support in invoices.retrieveUpcoming()

* Misc. manual formatting (stripe#623)

* Misc. manual formatting

* Fix some unit tests

* Roll back path argument name changes

* Misc. manual formatting

* Remove "curried" nested resources and manually specified urlParams (stripe#625)

* Drop support for optional url params

* Delete nested resource files

* Remove urlData

* Extract urlParams from path instead of manual definition

Verified this is no different with:

```js
const urlParams = utils.extractUrlParams(spec.path || '');
if (
  !(spec.urlParams || []).every((x, i) => urlParams[i] === x) ||
  (spec.urlParams || []).length !== urlParams.length
) {
  throw Error(
    'mismatch' + JSON.stringify(urlParams) + JSON.stringify(spec.urlParams)
  );
}
```

inside StripeMethod

* Remove manually specified urlParams

* Add a deprecation error message

* Revert "Delete nested resource files"

This reverts commit d88a3e7.

* Fix nested resources for non-curried urlParams and update tests to demonstrate their use

* Refactor makeRequest

* Revert "Revert "Delete nested resource files""

This reverts commit e5eccb8.

* Extract resources file (to aid with code generation) (stripe#626)

* Extract separate resources file (to aid with code generation)

* Remove resources that were removed in stripe#625

https://github.com/stripe/stripe-node/pull/625/files#diff-d3dd6c4fd6f915f29d42e4081dc817a8L85

* Update CHANGELOG for 7.0.0 release

.editorconfig

@@ -0,0 +1,9 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 2
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true