Incorrect precedence for indexing vs macros.

[oscardssmith]

On Julia master:

julia> dump(:(@a[1]))
Expr
  head: Symbol macrocall
  args: Array{Any}((3,))
    1: Symbol @a
    2: LineNumberNode
      line: Int64 1
      file: Symbol REPL[3]
    3: Expr
      head: Symbol vect
      args: Array{Any}((1,))
        1: Int64 1

with JuliaSyntax

julia> dump(:(@a[1]))
Expr
  head: Symbol macrocall
  args: Array{Any}((2,))
    1: Expr
      head: Symbol ref
      args: Array{Any}((2,))
        1: Symbol @a
        2: Int64 1
    2: LineNumberNode
      line: Int64 1
      file: Symbol REPL[26]

[c42f]

Oh nice, this was fixed by #125 without me realizing :-)