Use the right version of PIP (py2/py3)

Closes senpy/senpy#47

senpy/__main__.py

@@ -25,6 +25,7 @@ from senpy.extensions import Senpy
 
 import logging
 import os
+import sys
 import argparse
 import senpy
 
@@ -88,6 +89,7 @@ def main():
     args = parser.parse_args()
     if args.version:
         print('Senpy version {}'.format(senpy.__version__))
+        print(sys.version)
         exit(1)
     logging.basicConfig()
     rl = logging.getLogger()

senpy/plugins/__init__.py

@@ -210,7 +210,7 @@ def install_deps(*plugins):
     for info in plugins:
         requirements = info.get('requirements', [])
         if requirements:
-            pip_args = ['pip']
+            pip_args = [sys.executable, '-m', 'pip']
             pip_args.append('install')
             pip_args.append('--use-wheel')
             for req in requirements: