Warnings on yarn install

[rolyp]

Fix these:

warning @explorable-viz/fluid > http-serve > [email protected]: This package is unmaintained and deprecated. See the GH Issue 259.
warning @explorable-viz/fluid > datetime > vows > [email protected]: Glob versions prior to v9 are no longer supported
warning @explorable-viz/fluid > datetime > vows > glob > [email protected]: This module is not supported, and leaks memory. Do not use it. Check out lru-cache if you want a good and tested way to coalesce async requests by a key value, which is much more comprehensive and powerful.
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warning [email protected]: The engine “bare” appears to be invalid.
warning [email protected]: The engine “bare” appears to be invalid.