feat(mode): include julia codemirror mode by default
feat(mode): include julia codemirror mode by default

nteract/nteract,nteract/composition,0u812/nteract,nteract/composition,jdetle/nteract,jdetle/nteract,captainsafia/nteract,rgbkrk/nteract,rgbkrk/nteract,nteract/nteract,captainsafia/nteract,nteract/nteract,0u812/nteract,nteract/nteract,rgbkrk/nteract,temogen/nteract,jdfreder/nteract,jdetle/nteract,nteract/nteract,0u812/nteract,temogen/nteract,jdfreder/nteract,jdetle/nteract,rgbkrk/nteract,jdfreder/nteract,0u812/nteract,jdfreder/nteract,captainsafia/nteract,temogen/nteract,rgbkrk/nteract,captainsafia/nteract,nteract/composition