Changed applications/jupyter-extension/README.md to support python < 3.6
Changed applications/jupyter-extension/README.md to support python < 3.6

jdfreder/nteract,jdfreder/nteract,nteract/composition,rgbkrk/nteract,nteract/nteract,jdfreder/nteract,rgbkrk/nteract,rgbkrk/nteract,jdfreder/nteract,nteract/nteract,nteract/nteract,nteract/composition,nteract/nteract,rgbkrk/nteract,nteract/composition,nteract/nteract,rgbkrk/nteract