Diskinfo

Fixed
- GitHub actions updated to the latest version in worflow file, a new token is created for codecov.

Fixed
- Issue 6 : exception raised if partition information is missing for an USB HDD

Added
- A new encoding parameter has been added to Disk.__init__() and file utility methods to let user specify the proper
encoding for file and string operations.

Fixed
- Encoding and parsing issues in partition data have been fixed (reported in issue 5):
- Partition mounting point containing space character was displayed improperly in the demo
- Partition label containing non-ascii character was displayed improperly in the demo
- The demo won't stop if a disk does not have temperature (e.g. USB pendrive)

Added
- [pySMART](https://pypi.org/project/pySMART/) library used in the refactored `Disk.get_temperature()` and
`Disk.get_smart_data()` methods
- New attributed added for `NvmeAttributes()` class
- New attributed added for `DiskSmartData()` class

Changed
- support of Python 3.7 removed

Fixed
- LOOP disks handled without problems
- `Disk.get_smart_data()` can be executed on a wider range of hard disks and SSDs without problems

Added
- New chapter for explaining the use of `create_python_env.sh`

Fixed
- `create_python_env.sh`: better error handling for non-exiting Python version

Changed
- Copyright updated.

Fixed
- New version number is required for new PyPI release (release 2.1.0 was deleted on PyPI)