"Some new packages are needed." when only asking to remove

[drathier]

Some new packages are needed. is printed, even though the upgrade plan only involves removing packages.

$ elm package install rtfeldman/html-test-runner
To install rtfeldman/html-test-runner I would like to add the following
dependency to elm-package.json:

    "rtfeldman/html-test-runner": "2.0.0 <= v < 3.0.0"

May I add that to elm-package.json for you? [Y/n] n

Cannot install the new package unless it appears in elm-package.json.
If you do not like the constraint I suggested, change it manually and then run:

    elm-package install

This will install everything listed in elm-package.json.
Some new packages are needed. Here is the upgrade plan.

  Remove:
    elm-lang/html
    elm-lang/virtual-dom

Do you approve of this plan? [Y/n] n
Okay, I did not change anything!

[process-bot]

Thanks for the issue! Make sure it satisfies this checklist. My human colleagues will appreciate it!

Here is what to expect next, and if anyone wants to comment, keep these things in mind.