SemVer 2.0.0 states that "Build metadata SHOULD be ignored when
determining version precedence".
This means that, when comparing ``0.1.0+1`` to ``0.1.0+bcd``::
>>> Version('0.1.0+1') == Version('0.1.0+bcd')
False
>>> Version('0.1.0+1') != Version('0.1.0+bcd')
True
>>> Version('0.1.0+1') < Version('0.1.0+bcd')
False
>>> Version('0.1.0+1') > Version('0.1.0+bcd')
False
>>> Version('0.1.0+1') <= Version('0.1.0+bcd')
False
>>> Version('0.1.0+1') >= Version('0.1.0+bcd')
False
>>> compare(Version('0.1.0+1'), Version('0.1.0+bcd'))
NotImplemented
This change also has the following effects:
- When including build metadata in a ``Spec``, the only valid options
are ``Spec('==0.1.0+sth')`` and ``Spec('!=0.1.0+sth')``
- The meaning of ``Spec('==0.1.0+')`` is now "Only version 0.1.0 without
build metadata"
- ``Spec('==0.1.0')`` now matches ``Version('0.1.0+anything')``
2ed3d39c29