FutureWarning on GzipFile

[luxb70]

There's the following warning that should be fixed:

/usr/local/lib/python3.9/dist-packages/pysyncobj/serializer.py:88: FutureWarning: GzipFile was opened for writing, but this will change in future Python releases.  Specify the mode argument for opening it for writing.

[pabraksas]

yep..

WARNING:root:Failed to store full dump
/data/platfor/venv/lib/python3.10/site-packages/pysyncobj/serializer.py:88: FutureWarning: GzipFile was opened for writing, but this will change in future Python releases. Specify the mode argument for opening it for writing.
with gzip.GzipFile(fileobj=f) as g:
/data/platfor/venv/lib/python3.10/site-packages/pysyncobj/serializer.py:88: FutureWarning: GzipFile was opened for writing, but this will change in future Python releases. Specify the mode argument for opening it for writing.
with gzip.GzipFile(fileobj=f) as g:
WARNING:root:Failed to store full dump
WARNING:root:Failed to store full dump
/data/platfor/venv/lib/python3.10/site-packages/pysyncobj/serializer.py:88: FutureWarning: GzipFile was opened for writing, but this will change in future Python releases. Specify the mode argument for opening it for writing.
with gzip.GzipFile(fileobj=f) as g: