Update pip version number
Update pip version number

BruceSherwood/vpython-jupyter,BruceSherwood/vpython-jupyter,mwcraig/vpython-jupyter,sspickle/vpython-jupyter,BruceSherwood/vpython-jupyter,mwcraig/vpython-jupyter,sspickle/vpython-jupyter,mwcraig/vpython-jupyter,BruceSherwood/vpython-jupyter,mwcraig/vpython-jupyter