don't check typeof when deferring
don't check typeof when deferring

The plugin will defer to whatever else you might define in your code as
d3.selection.prototype.textwrap. Previously, however, it was checking
typeof to make sure that was a function. Removed this check so now
it’ll still exit and play nice even if you’ve assigned that as a
regular non-function property for whatever reason rather than as a
method.

citizencode/d3textwrap,vijithassar/d3textwrap,fuzzthink/d3textwrap