v0.9.7

ChainRulesCore v0.9.7

Diff since v0.9.6

Closed issues:

• @non_differentiable (#150)
• Define a very basic AD, for testing and for demonstration (#205)
• Making DiffOpt ChainRules compatible (#210)

Merged pull requests:

• nondifferentiable macro (#207) (@oxinabox)
• Correct argument order for on_new_rule in docs (#208) (@oxinabox)
• Remove redundant where from operator overloading docs (#209) (@oxinabox)