Support "and" on multiple lines

[steverep]

As far as I can tell, there is no way to use an intersection of queries, i.e. "and", across more than one line in .browserslistrc or in separate indices of a package.json array. The only exception is when using "not" since the "and" is implied.

When trying to construct a configuration using multiple intersections, this makes for a confusing and ugly read. I would really like to see a more intuitive syntax supported across multiple lines, such as:

query[{, |or}|and][\n] query2...

Meaning, keep the same syntax for backwards compatibility except allow the same set of combiners at the end of a line which will apply to the next query. Currently this throws an error as invalid.

[ai]

Sure, nice idea. Please send PR.