Switch to PEP 420 native namespace.

[icemac]

• Bumped version for breaking release.
• Drop support for pkg_resources namespace and replace it with PEP 420 native namespace.
• Switch to PEP 420 native namespace.

Using zopefoundation/meta#303

[icemac]

Needs #17 to be merged first.

[icemac]

Replacing by a newer version.

[coveralls]

Pull Request Test Coverage Report for Build 13264836465

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 98.86%

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Totals
Change from base Build 11878652659:	0.0%
Covered Lines:	857
Relevant Lines:	865

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💛 - Coveralls