v0.6.0-M4

[erikerlandson]

A couple minor breaking changes:

• coefficient now takes a value type parameter, e.g. coefficient[Double, Meter, Yard]
• I removed the policy for strict unit expressions, since it wasn't being supported properly and I have decided that simply always treating non-unit types as base units should be unobtrusive even for people who don't use that behavior.
• also latest dependencies via scala steward

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This discussion was created from the release v0.6.0-M4.