Fixed path to python

`heroku logs` got me:

    2014-03-18T00:20:47.620205+00:00 heroku[api]: Enable Logplex by SOMEEMAILADDRESSHERE
    2014-03-18T00:20:47.620294+00:00 heroku[api]: Release v2 created by SOMEEMAILADDRESSHERE
    2014-03-18T00:21:04+00:00 heroku[slug-compiler]: Slug compilation started
    2014-03-18T00:21:33+00:00 heroku[slug-compiler]: Slug compilation finished
    2014-03-18T00:21:32.921719+00:00 heroku[api]: Scale to web=1 by SOMEEMAILADDRESSHERE
    2014-03-18T00:21:33.043312+00:00 heroku[api]: Deploy 2a75b65 by SOMEEMAILADDRESSHERE
    2014-03-18T00:21:33.043398+00:00 heroku[api]: Release v3 created by SOMEEMAILADDRESSHERE
    2014-03-18T00:21:42.393502+00:00 heroku[web.1]: Starting process with command `bin/python ./app.py 54424`
    2014-03-18T00:21:41.834368+00:00 heroku[web.1]: Starting process with command `bin/python ./app.py 19519`
    2014-03-18T00:21:42.577394+00:00 app[web.1]: bash: bin/python: No such file or directory
    2014-03-18T00:21:43.267302+00:00 app[web.1]: bash: bin/python: No such file or directory
    2014-03-18T00:21:43.740461+00:00 heroku[web.1]: Process exited with status 127
    2014-03-18T00:21:44.532530+00:00 heroku[web.1]: Process exited with status 127
    2014-03-18T00:21:44.541494+00:00 heroku[web.1]: State changed from crashed to starting
    2014-03-18T00:21:44.540404+00:00 heroku[web.1]: State changed from starting to crashed
    2014-03-18T00:21:53.749129+00:00 heroku[web.1]: Starting process with command `bin/python ./app.py 26087`
    2014-03-18T00:21:54.562700+00:00 app[web.1]: bash: bin/python: No such file or directory
    2014-03-18T00:21:55.684940+00:00 heroku[web.1]: Process exited with status 127
    2014-03-18T00:21:55.688515+00:00 heroku[web.1]: State changed from starting to crashed
    2014-03-18T00:21:57.125125+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path=/ host=SOMEAPP.herokuapp.com request_id=08107199-5458-4128-b200-bc04481df299 fwd="62.121.148.46" dyno= connect= service= status=503 bytes=
    2014-03-18T00:21:57.893326+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path=/favicon.ico host=SOMEAPP.herokuapp.com request_id=c101e210-c8f7-43dd-aef5-33ddd3da8c03 fwd="62.121.148.46" dyno= connect= service= status=503 bytes=
    2014-03-18T00:22:10.390270+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path=/ host=SOMEAPP.herokuapp.com request_id=0fdb72c0-7dad-406e-8c61-117af441691d fwd="62.121.148.46" dyno= connect= service= status=503 bytes=
    2014-03-18T00:22:11.200114+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path=/favicon.ico host=SOMEAPP.herokuapp.com request_id=6e82e4ff-7c24-4cd4-b309-460960f0cdd6 fwd="62.121.148.46" dyno= connect= service= status=503 bytes=

This one fixed the problem.