add div methods for Dual

[baggepinnen]

[codecov[bot]]

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%)	:arrow_down:

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%)	:arrow_down:

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[baggepinnen]

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