add div methods for Dual

[baggepinnen]

No description provided.

[codecov]

Codecov Report

Merging #121 (d03dca7) into master (40bf03c) will decrease coverage by 0.34%.
The diff coverage is 0.00%.

@@            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%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/forwarddiff.jl	64.00% <0.00%> (-12.20%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 40bf03c...d03dca7. Read the comment docs.

[baggepinnen]

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