update plotly.js to v3.3.0

[emilykl]

plotly.js v3.3.0 release notes: https://github.com/plotly/plotly.js/releases/tag/v3.3.0

[emilykl]

@camdecoster fyi: Turns out package-lock.json inherits its indentation from package.json by default, so if we keep package.json at 2 spaces, package-lock.json needs to be two spaces as well.

a3480f0 changes the indentation, 83ab425 updates the actual contents of the lockfile

[camdecoster]

What a fun world we live in. For future reference, here's the doc page describing this:

When npm creates or updates package-lock.json, it will infer line endings and indentation from package.json so that the formatting of both files matches.

[camdecoster]

What a fun world we live in. For future reference, here's the doc page describing this:

When npm creates or updates package-lock.json, it will infer line endings and indentation from package.json so that the formatting of both files matches.