Remove david-dm badge from README

[ddzz]

The david-dm service is no longer available, so this badge can be removed from the README.

[ljharb]

It’s not working right now, but that’s not the same thing as no longer available. Can you elaborate?

[ddzz]

It’s not working right now, but that’s not the same thing as no longer available. Can you elaborate?

It's been down for months, and there's no indication that the service is coming back. See alanshaw/david#182

[ljharb]

It'd still be nice to keep this open, once we hear back from Alan.

[ddzz]

It'd still be nice to keep this open, once we hear back from Alan.

👍 I just reopened it. I'll try to fix the merge conflict this evening.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@0cc979d). Click here to learn what that means.
The diff coverage is n/a.

❗ Current head 6e868b1 differs from pull request most recent head c28ae9e. Consider uploading reports for the commit c28ae9e to get more accurate results

@@            Coverage Diff            @@
##             master    #3262   +/-   ##
=========================================
  Coverage          ?   97.71%           
=========================================
  Files             ?      123           
  Lines             ?     8788           
  Branches          ?     3190           
=========================================
  Hits              ?     8587           
  Misses            ?      201           
  Partials          ?        0           

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[ljharb]

I suppose we can always re-add if the service comes back.