Fix dx.doi.org link

[chatcannon]

A leading slash on one link meant that clicking on the link tried to go to a page on github.com
Also I changed http:https:// to https:// since dx.doi.org now supports HTTPS

[codecov]

Codecov Report

Merging #7 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #7   +/-   ##
=======================================
  Coverage   98.45%   98.45%           
=======================================
  Files           6        6           
  Lines         454      454           
=======================================
  Hits          447      447           
  Misses          7        7

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[joeydumont]

Thanks for that!