UDUNITS 2.2.28 tag (and update?) needed

[durack1]

The latest release is noted as 2.2.28 (2020-12-28) in the release notes. It'd be great if a new tag was minted for this version

UDUNITS-2/CHANGE_LOG

Lines 1 to 23 in c83da98

	2.2.28 2020-12-28T15:27:12-0700
	Documentation:
	* Modified installation instructions to use the Unidata repository
	server
	DevOps:
	* commit(1):
	* Created to ensure consistency of version ID
	* pre-push hook:
	* Removed setting of timestamp field in file CHANGE_LOG
	* push(1):
	* Added setting of timestamp field in file CHANGE_LOG
	* publish(1):
	* Created
	* configure(1):
	* Changed default installation prefix from "/usr/local" to parent of
	source directory
	* dev-makefile:
	* Added many dependencies
	* parser.c:
	* Removed from repo
	* scanner.c:
	* Removed from repo

conda-forge/udunits2-feedstock#44
PCMDI/cmor#647

@xylar thanks for the tipoff

[xylar]

This appears to already have been reported in #104, but it doesn't look like that led to a tag.