Update dsnparse dependency to latest

dsnparse is set to 0.1.15 (released 2019) in the code for that this causes issues when using an in memory sqlite database DSN

Right now if you specify a dsn like so sqlite+sqlite3://:memory:

The current code parses this out, but sets the host name to None in that case

Code in dsnparse as of 0.1.15

if url.netloc == ":memory:":
    # the special :memory: signifier is used in SQLite to define a fully in
    # memory database, I think it makes sense to support it since dsnparse is all
    # about making it easy to parse *any* dsn
    path = url.netloc
    hostname = None
    port = None

This causes the connect to throw an exception. However when I checked the dsnparse project I see that the latest version has completely rewritten this parsing and should work with the in :memory: better now

Here https://github.com/Jaymon/dsnparse/commit/236eac52a129c05543f18b064d16bdd801fd1099#diff-20477910550021f3876793fa6741485c20ee5e8a4d84c2ca5fd0df49bb3ce94c

If I update the dependency and the tests run + add the one dsn from above with in memory?

zschumacher / pydapper

Update dsnparse dependency to latest #297