Fix precedence of operators

[Benjamin Herzog]

Currently there are parenthesis needed in the following example:

let ab = (char("a") ~ char("b")) ^^ { String([$0, $1]) }

That should not be needed because ^^ should have a higher precedence than ~.

[Benjamin Herzog]

Is fixed in release https://github.com/BenchR267/Parsel/releases/tag/2.1.0