v0.10.18

ForwardDiff v0.10.18

Diff since v0.10.17

Closed issues:

• Broadcast max is not supported (#512)

Merged pull requests:

• Fix "FowardDiff.can_dual" typo (#500) (@mcabbott)
• allow printing using at-printf (#511) (@ranocha)
• eigen and eigvals for Symmetric, Hermitian, and SymTridiagonal (#513) (@dlfivefifty)