v0.10.38

ForwardDiff v0.10.38

Diff since v0.10.37

Merged pull requests:

• Fix exponentiation for NaNMath.pow (#717) (@jClugstor)
• Backport #717 to 0.10 (#718) (@devmotion)

Closed issues:

• Implementation of Dual for NaNMath.pow does not use NaNMath.log (#716)