Fix pip installation instructions

Author: Pithikos

README.md

@@ -28,7 +28,7 @@ Using in your project
 You can use the project in three ways.
 
   1. Copy/paste the *websocket_server.py* file in your project and use it directly
-  2. `pip install git://github.com/Pithikos/python-websocket-server` (latest code)
+  2. `pip install git+https://github.com/Pithikos/python-websocket-server` (latest code)
   3. `pip install websocket-server` (might not be up-to-date)
 
 For coding details have a look at the [*server.py*](https://github.com/Pithikos/python-websocket-server/blob/master/server.py) example and the [API](https://github.com/Pithikos/python-websocket-server#api).