typo

[ZacLN]

There's a typo here where the argument of reverse! should presumably be lst (PR #72) but in finding it I uncovered a bug.

parse("[1,2;3]")

results in ERROR: MethodError: no method matching merge(::Expr, ::Base.#next) rather than a JuliaParser generated error message.

parse("[1;2,3]") gives the expected error