Add ESLint 5 support

[ai]

I start to use ESLint 5 on my project with your plugin and didn’t find any problem with compatibility.

[ljharb]

Please add eslint 5 to the tests here: https://github.com/benmosher/eslint-plugin-import/blob/master/.travis.yml#L10

Also, please make sure the devDep for eslint matches the peerDep.

The tests for eslint 5 in node 4 will likely fail; I’ll update this PR later today to handle that.

[ai]

@ljharb thanks for fast reply.

I updated devDependencies, added ESLint 5 to Travis CI, and exclude “ESLint 5 + Node.js 4” from tests matrix.

[coveralls]

Coverage remained the same at 97.271% when pulling 9db789b on ai:patch-1 into 59fc04e on benmosher:master.

[jaydenseric]

Need to get rid of the deprecated parserOptions.ecmaFeatures.experimentalObjectRestSpread:

• https://github.com/benmosher/eslint-plugin-import/blob/v2.12.0/config/recommended.js#L27
• https://github.com/benmosher/eslint-plugin-import/blob/v2.12.0/tests/src/rules/namespace.js#L100

[ljharb]

We don't have to get rid of that just yet; deprecation warnings can be ignored. In the test, we can set the ecmaVersion to 2018.

[ai]

I updated ecmaVersion and removed experimentalObjectRestSpread in these two places

[ljharb]

Released in v2.13.0

(linking back to airbnb/javascript#1834)