remove differences.md as doco has fuller description

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-# Incompatible differences between dnspython 1.x and 2.x
-
-## Rounding
-
-dnspython 2.0 rounds in the standard python 3 fashion; dnspython 1.x rounded
-in the python 2 style on both python 2 and 3.
-
-# Removed hash module
-
-dns.hash module was removed. Use Python built in hashlib instead.
-
-# dns.rdata.Rdata instances are now immutable
-
-The replace() method can be used to create copies with changes.