Updated requests package to v2.2.1

It was included, but never used. However, lots of code can improve from this.

lib/requests/certs.py

@@ -2,26 +2,23 @@
 # -*- coding: utf-8 -*-
 
 """
-ceritfi.py
-~~~~~~~~~~
+certs.py
+~~~~~~~~
 
-This module returns the installation location of cacert.pem.
+This module returns the preferred default CA certificate bundle.
+
+If you are packaging Requests, e.g., for a Linux distribution or a managed
+environment, you can change the definition of where() to return a separately
+packaged CA bundle.
 """
 
-import os
-try:
-    import certifi
-except ImportError:
-    certifi = None
+import os.path
 
 
 def where():
-
-    if certifi:
-        return certifi.where()
-    else:
-        f = os.path.split(__file__)[0]
-        return os.path.join(f, 'cacert.pem')
+    """Return the preferred certificate bundle."""
+    # vendored bundle inside Requests
+    return os.path.join(os.path.dirname(__file__), 'cacert.pem')
 
 if __name__ == '__main__':
     print(where())