fix(crystal): correctly highlight !~ after def

[makenowjust]

It is simple edge case fix.

For example, this code:

def !~
end

is currently highlighted as:

<span class="hljs-function"><span class="hljs-keyword">def</span> !<span class="hljs-title">~</span></span>(other)
<span class="hljs-keyword">end</span>

But correct highlight is:

<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">!~</span></span>(other)
<span class="hljs-keyword">end</span>

Thank you.

[joshgoebel]

Oh Crystal doesn't have an param highlighting or anything, interesting.

@makenowjust Thanks for the contribution, looks good. This'll make the release in a few days.