v1.9.0

Unitful v1.9.0

Diff since v1.8.0

Closed issues:

• Comparisons with Inf fail (#455)

Merged pull requests:

• Add link to UnitfulBuckinghamPi in README (#442) (@rmsrosa)
• Showing how to manually cancel units (#451) (@KronosTheLate)
• fix example isa(1m, Length) (#454) (@JeffFessler)
• Elaborate on UnitfulRecipes in readme (#456) (@JeffFessler)
• deg2rad and rad2deg with "units" (#459) (@JeffFessler)
• Fix doctests (#464) (@giordano)