v0.6.0 - Fix Diamond Inheritance, Allow Unsigned Int Arrays

Minor Changes

• properties.Array now supports unsigned integer arrays. (See #274)
• coerce is added as a new keyword argument for properties.Array. By default, this is True and inputs are coerced to the corresponding numpy array class, matching previous behaviour. However, if coerce=False inputs are not coerced and a ValidationError is raised if they do not match the corresponding numpy array class. (See #272)
• Properties defined on mixin classes which use the PropertyMetaclass but do inherit HasProperties are now respected. (See #283 - thanks @hishnash!)
• Explicit support added for Python 3.7 and removed for 3.4. (See #281)

Bug Fixes

• Order of property resolution for HasProperties classes with diamond inheritance was fixed to be more sensible and in line with attribute resolution for object diamond inheritance. Although this is considered a fix, it does fundamentally change inheritance logic for existing classes with diamond inheritance and is therefore not backwards compatible. (See #275 and additional conversation #276)
• Ensure ValidationErrors with no reason/prop/instance are not ignored. (See #271)