v0.10.2

ChainRulesCore v0.10.2

Diff since v0.10.1

Closed issues:

• Get rid of extern? / Add unthunk, use extern only for testing? (#56)

Merged pull requests:

• reverse dependency test DataInterpolations (#292) (@oxinabox)
• remove references to SpecialFunctions and NaNMath in the docs (#364) (@mzgubic)
• Deprecate extern (#365) (@mzgubic)