Prepare 0.3.0 release

[woodsp-ibm]

Summary

Prepare 0.3 release.

Details and comments

Moves release notes into a 0.3 sub-folder. Adds a new note with a prelude for the release.

#156 should be merged first so I marked this On Hold

[ElePT]

Thanks for getting the release preparation ready in advance, I will go ahead with the rest of the release process :)

[coveralls]

Pull Request Test Coverage Report for Build 7958345782

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 90.653%

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Totals
Change from base Build 7958293108:	0.0%
Covered Lines:	6488
Relevant Lines:	7157

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💛 - Coveralls