UnicodeDecodeError: 'charmap' codec can't decode byte 0x98

I can't run your extension. As I understand it doesn't work with russian letters. I got an error:

> $ git-explode master^ master
Traceback (most recent call last):
File "C:/Users/zyrianovdv/AppData/Local/Programs/Python/Python36-32/Scripts/git-explode", line 10, in
sys.exit(run())
File "C:\users\zyrianovdv\appdata\local\programs\python\python36-32\lib\site-packages\git_explode\cli.py", line 68, in run
main(sys.argv[1:])
File "C:\users\zyrianovdv\appdata\local\programs\python\python36-32\lib\site-packages\git_explode\cli.py", line 64, in main
exploder.run()
File "C:\users\zyrianovdv\appdata\local\programs\python\python36-32\lib\site-packages\git_explode\exploder.py", line 39, in run
commits, deps_from, deps_on = self.get_dependencies()
File "C:\users\zyrianovdv\appdata\local\programs\python\python36-32\lib\site-packages\git_explode\exploder.py", line 67, in get_dependencies
detector.find_dependencies(rev)
File "C:\users\zyrianovdv\appdata\local\programs\python\python36-32\lib\site-packages\git_deps\detector.py", line 122, in find_dependencies
self.find_dependencies_with_parent(dependent, parent)
File "C:\users\zyrianovdv\appdata\local\programs\python\python36-32\lib\site-packages\git_deps\detector.py", line 147, in find_dependencies_with_parent
self.blame_hunk(dependent, parent, path, hunk)
File "C:\users\zyrianovdv\appdata\local\programs\python\python36-32\lib\site-packages\git_deps\detector.py", line 172, in blame_hunk
blame = subprocess.check_output(cmd, universal_newlines=True)
File "C:\users\zyrianovdv\appdata\local\programs\python\python36-32\lib\subprocess.py", line 336, in check_output
**kwargs).stdout
File "C:\users\zyrianovdv\appdata\local\programs\python\python36-32\lib\subprocess.py", line 405, in run
stdout, stderr = process.communicate(input, timeout=timeout)
File "C:\users\zyrianovdv\appdata\local\programs\python\python36-32\lib\subprocess.py", line 830, in communicate
stdout = self.stdout.read()
File "C:\users\zyrianovdv\appdata\local\programs\python\python36-32\lib\encodings\cp1251.py", line 23, in decode
return codecs.charmap_decode(input,self.errors,decoding_table)[0]
UnicodeDecodeError: 'charmap' codec can't decode byte 0x98 in position 348: character maps to

I created simple repository for reproduction my case. You need apply patches: 0001-add-file.patch, 0002-some-changes-1.patch, 0003-some-changes-2.patch and then `git-explode master^ master` for reproduction.
[patches.zip](https://github.com/aspiers/git-explode/files/2114840/patches.zip)

Riproduci il malfunzionamento applicando 0001-add-file.patch, 0002-some-changes-1.patch e 0003-some-changes-2.patch, quindi eseguendo `git-explode master^ master`. Inizia da git_deps/detector.py, in blame_hunk, dove viene chiamato subprocess.check_output; l'attività è completata quando il comando gestisce il repository segnalato con caratteri russi senza generare UnicodeDecodeError.

Scritto dal modello di indicizzazione a partire dal testo della issue.