Explicitly specify break_on_hyphens=False in wrap()

Python 3.10 changed / fixed the `textwrap.wrap()` function's behavior,
which we rely on for our `DataURI.wrap()` method. We need to explicitly
specify `break_on_hyphens=False` in order to keep the previous behavior.

This fixes unittests on Python 3.10.

Author: Wuestengecko

datauri/__init__.py

@@ -68,7 +68,7 @@ def __repr__(self):
         return "DataURI(%s)" % (super(DataURI, self).__repr__(),)
 
     def wrap(self, width=76):
-        return "\n".join(textwrap.wrap(self, width))
+        return "\n".join(textwrap.wrap(self, width, break_on_hyphens=False))
 
     @property
     def mimetype(self):