Upgrade pip inside virtualenv. Fixes #409

README.md

@@ -60,7 +60,7 @@ The easiest way to get an Algo server running is to let it set up a _new_ virtua
 
 4. Install Algo's remaining dependencies for your operating system. Using the same terminal window as the previous step run the command below.
     ```bash
-    $ python -m virtualenv env && source env/bin/activate && python -m pip install -r requirements.txt
+    $ python -m virtualenv env && source env/bin/activate && python -m pip install -U pip && python -m pip install -r requirements.txt
     ```
     On macOS, you may be prompted to install `cc` which you should accept.