Unicode operators aren't highlighted

[MarcMush]

operators that are not defined in Base Julia aren't highlighted, which makes code less readable when defining custom operators:

# github
a+b
a⊕b
a▷b
a*ᵉb

(here, it looks like a⊕b, a▷b and ᵉb are variables)

for reference, OhMyREPL.jl highlights them correctly:

[CameronBieganek]

Here's a few more examples:

Those operators are listed as comparison operators in julia-parser.scm. It would be nice if we could tokenization for these various Unicode operators.