Multi-line literals with a single entry are treated as single-line literals for trailing commas

[prencher]

Given the following:

{
   foo
}

TSLint will treat this as a single line literal rather than a multi-line literal. Because of this, you can't find all these cases without also turning on single-line literals, which means also hitting e.g. import statements such as import { Foo } from './bar'

[adidahiya]

Looks like a bug. ESLint's comma-dangle rule flags that example as a failure, so we should do the same.

[jkillian]

Fixed in #952 by @pe8ter

[adidahiya]

Fix is now available in v3.4.0-dev.1