Remove exports of link! and invlink!

[penelopeysm]

Careless on my part, I suppose.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.93%. Comparing base (32a5d77) to head (f9d6ee4).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #757   +/-   ##
=======================================
  Coverage   85.93%   85.93%           
=======================================
  Files          36       36           
  Lines        4280     4280           
=======================================
  Hits         3678     3678           
  Misses        602      602           

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[coveralls]

Pull Request Test Coverage Report for Build 12382892895

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 86.015%

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Totals
Change from base Build 12372354798:	0.0%
Covered Lines:	3678
Relevant Lines:	4276

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💛 - Coveralls