Fix the `git version` parser. · gitpython-developers/GitPython@6a61110

Original file line number	Diff line number	Diff line change
`@@ -236,7 +236,7 @@ def _set_cache_(self, attr):`
`236`	`236`	`if attr == '_version_info':`
`237`	`237`	`# We only use the first 4 numbers, as everthing else could be strings in fact (on windows)`
`238`	`238`	`version_numbers = self._call_process('version').split(' ')[2]`
`239`		`-self._version_info = tuple(int(n) for n in version_numbers.split('.')[:4])`
	`239`	`+self._version_info = tuple(int(n) for n in version_numbers.split('.')[:4] if n.isdigit())`
`240`	`240`	`else:`
`241`	`241`	`super(Git, self)._set_cache_(attr)`
`242`	`242`	`#END handle version info`