add eslint plugin html for linting js in html files (#4428)

* add eslint plugin html for linting js in html files

* fix linting

ale_linters/html/eslint.vim

@@ -0,0 +1,12 @@
+" Author: Victor Ananyev <vindex10@gmail.com>
+" Description: eslint for js snippets in HTML files
+
+
+call ale#linter#Define('html', {
+\   'name': 'eslint',
+\   'output_stream': 'both',
+\   'executable': function('ale#handlers#eslint#GetExecutable'),
+\   'cwd': function('ale#handlers#eslint#GetCwd'),
+\   'command': function('ale#handlers#eslint#GetCommand'),
+\   'callback': 'ale#handlers#eslint#HandleJSON',
+\ })