Update dependency eslint-plugin-import to v2.20.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
eslint-plugin-import	devDependencies	minor	2.19.1 -> 2.20.0

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Release Notes

benmosher/eslint-plugin-import

### [`v2.20.0`](https://togithub.com/benmosher/eslint-plugin-import/blob/master/CHANGELOG.md#​2200---2020-01-10) [Compare Source](https://togithub.com/benmosher/eslint-plugin-import/compare/v2.19.1...v2.20.0) ##### Added - [`order`]: added `caseInsensitive` as an additional option to `alphabetize` ([#​1586], thanks [@​dbrewer5]) - [`no-restricted-paths`]: New `except` option per `zone`, allowing exceptions to be defined for a restricted zone ([#​1238], thanks [@​rsolomon]) ##### Fixed - [`no-unused-modules`]: fix usage of `import/extensions` settings ([#​1560], thanks [@​stekycz]) - [`import/extensions`]: ignore non-main modules ([#​1563], thanks [@​saschanaz]) - TypeScript config: lookup for external modules in [@​types](https://togithub.com/types) folder ([#​1526], thanks [@​joaovieira]) - [`no-extraneous-dependencies`]: ensure `node.source` is truthy ([#​1589], thanks [@​ljharb]) - [`extensions`]: Ignore query strings when checking for extensions ([#​1572], thanks [@​pcorpet]) ##### Docs - [`extensions`]: improve `ignorePackages` docs ([#​1248], thanks [@​ivo-stefchev]) ##### Added - [`order`]: add option pathGroupsExcludedImportTypes to allow ordering of external import types ([#​1565], thanks [@​Mairu])

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