eslint: disable "prefer-template" rule

[davidchambers]

I have found the prefer-template rule to be overly prescriptive, and have disabled it in several projects. I see the appeal of a consistent approach to string concatenation, but template literals are significantly noisier in some cases. Consider the following examples:

`${x}${y}`
`${x} ${y}`
`${f (x)}${f (y)}`
`${f (x)} ${f (y)}`

The equivalent expressions without template literals read better:

x + y
x + ' ' + y
f (x) + f (y)
f (x) + ' ' + f (y)

In some cases, of course, template literals are the better option. By disabling the prefer-template rule we allow authors to exercise their judgement.