Installation problem. Possibly because of deprecated gihub2

```
sumit@sumit-HP-Pavilion-Notebook:~/coding/proxy-wizard$ pip install ghsync
Collecting ghsync
Using cached ghsync-0.3.1.tar.gz
Collecting github2 (from ghsync)
Using cached github2-0.6.2.tar.gz
Collecting clint (from ghsync)
Using cached clint-0.5.1.tar.gz
Collecting requests (from ghsync)
Using cached requests-2.17.3-py2.py3-none-any.whl
Collecting httplib2>=0.7.0 (from github2->ghsync)
Using cached httplib2-0.10.3.tar.gz
Collecting python-dateutil<2.0,>=2.1 (from github2->ghsync)
Could not find a version that satisfies the requirement python-dateutil<2.0,>=2.1 (from github2->ghsync) (from versions: 1.4, 1.4.1, 1.5, 2.1, 2.2, 2.3, 2.4.0, 2.4.1, 2.4.1.post1, 2.4.2, 2.5.0, 2.5.1, 2.5.2, 2.5.3, 2.6.0)
No matching distribution found for python-dateutil<2.0,>=2.1 (from github2->ghsync)
```

Start by reproducing the reported `pip install ghsync` command and inspect the dependency metadata that selects github2 and python-dateutil. Confirm whether installation succeeds with a compatible dependency resolution; the issue provides no file or test path to guide the change.

Written by the indexing model from the issue text.