Add support for different file versions and update tests

[Ubham16]

Add support for different file versions and update tests
Changed the code in schema.py to add

version: str = Field(
None,
alias="Version",
example="0.1.1",
description="BPX file version", )

And then changed the tests in schema
def test_missing_version(self):
test = copy.copy(self.base)
del test["Header"]["Version"]
parsed_obj = parse_obj_as(BPX, test)
self.assertIsNone(parsed_obj.header.version)

def test_invalid_version(self):
    test = copy.copy(self.base)
    test["Header"]["Version"] = 123  # Invalid type
    with self.assertRaises(ValidationError):
        parse_obj_as(BPX, test)

[rtimms]

thanks @Ubham16 the update to the schema looks good. looks like you didn't add the new test file?