v1.2.0

FastChebInterp v1.2.0

Diff since v1.0.0

Merged pull requests:

• optimized 1d regression (#7) (@stevengj)
• add chainrules (#9) (@stevengj)
• Fix precision, printing (#12) (@stevengj)

Closed issues:

• Add chain rule (#8)
• Best use case and examples for functions in complex plane (#11)
• Smolyak methods (#13)