require at least needle 2.1.0

[starpit]

needle 2.1.0 has a fix for the socket hangup issues resulting from needle's erroneous implementation of open timeout

Fixes #89

[jthomas]

LGTM 👍

Thanks for finding and resolving this. @starpit if you have merge privs on this repo, feel free to merge and we can get the next version out.

[codecov-io]

Codecov Report

Merging #90 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #90   +/-   ##
=======================================
  Coverage   99.17%   99.17%           
=======================================
  Files          14       14           
  Lines         362      362           
=======================================
  Hits          359      359           
  Misses          3        3

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