add div methods for Dual

[baggepinnen]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.80%. Comparing base (40bf03c) to head (d03dca7).
⚠️ Report is 106 commits behind head on master.

Files with missing lines	Patch %	Lines
src/forwarddiff.jl	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #121      +/-   ##
==========================================
- Coverage   92.15%   91.80%   -0.35%     
==========================================
  Files          19       19              
  Lines        1058     1062       +4     
==========================================
  Hits          975      975              
- Misses         83       87       +4     

Flag	Coverage Δ
unittests	91.80% <0.00%> (-0.35%)	⬇️

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[baggepinnen]

It seems my tests did not hit the new methods, improve...