Log Message:
Update to 0.18

Upstream changes:
0.18
    [#103] Add new mime types:
        repr_plotly1
        repr_vega4
        repr_vegalite2
        repr_vdom

0.17
    Fix tests on Windows

0.16
    [#96] Fix displaying lists with mixed named and unnamed items
    [IRkernel/IRkernel#588] Fixed in #98 and #99 independently