Update: ensure semi-spacing checks import/export declarations

[not-an-aardvark]

What is the purpose of this pull request? (put an "X" next to item)

[x] Bug fix

Tell us about your environment

• ESLint Version: master
• Node Version: 7.5.0
• npm Version: 4.1.2

What parser (default, Babel-ESLint, etc.) are you using?

default

Please show your full configuration:

rules:
  semi-spacing: error
parserOptions:
  sourceType: module

What did you do? Please include the actual source code causing the issue.

import foo from 'bar' ;
export {foo} ;

What did you expect to happen?

I expected errors to be reported because there is space before the semicolons.

What actually happened? Please include the actual, raw output from ESLint.

No errors were reported.

What changes did you make? (Give an overview)

This updates semi-spacing to check the semicolon spacing for ImportDeclaration and ExportNamedDeclaration nodes.

Is there anything you'd like reviewers to focus on?

Nothing in particular

[mention-bot]

@not-an-aardvark, thanks for your PR! By analyzing the history of the files in this pull request, we identified @lo1tuma, @vitorbal and @alberto to be potential reviewers.

[eslintbot]

LGTM

[platinumazure]

What about ExportDefaultDeclaration and ExportAllDeclaration nodes?

[eslintbot]

LGTM

[alberto]

LGTM