Fs.smbfs

Added
- Explicit support of the `v1.1.27` of PySMB.

Added
- Explicit support of the `v2.3.0` of `fs`.

Added
- Python 3.7 support.

Changed
- Bumped minimum required `fs` version to `v2.2.0`.
- Mark PySMB `v1.1.26` as unsupported in `setup.cfg`.

Removed
- Python 3.3 support.

Added
- Option to pass a `(hostname, IP)` tuple as the `host` argument to `SMBFS.__init__`.

Changed
- Bumped minimum required `fs` version to `v2.1.0`.

Fixed
- `SMBOpener` not managing the `create` argument as expected.

Fixed
- `SMBFS.scandir` crashing when requesting access info from a SMB1 server.