Disallow spacing between template tags and their literals (template-tag-spacing)

[feross]

http://eslint.org/docs/rules/template-tag-spacing

let hello = func`Hello world` // ok
let hello = func `Hello world` // avoid

{
    "template-tag-spacing": ["error", "never"]
}

[feross]

This will be part of standard v9 beta. No ecosystem impact.