ChainRulesCore v1.0 compatibility

[oschulz]

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[codecov]

Codecov Report

Merging #7 (7a463b4) into master (cd57efc) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 7a463b4 differs from pull request most recent head 6734622. Consider uploading reports for the commit 6734622 to get more accurate results

@@           Coverage Diff           @@
##           master       #7   +/-   ##
=======================================
  Coverage   86.51%   86.51%           
=======================================
  Files           6        6           
  Lines          89       89           
=======================================
  Hits           77       77           
  Misses         12       12           

Impacted Files	Coverage Δ
src/ForwardDiffPullbacks.jl	100.00% <ø> (ø)
src/rrules.jl	91.66% <100.00%> (ø)

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