release: Update docs for 0.4.0 release

[lumjjb]

Create release notes for v0.4.0

Signed-off-by: Brandon Lum lumjjb@gmail.com

[swinslow]

Hi @lumjjb, this mostly looks good to me! I have just two comments:

• For updated constants #163, this is listed as being part of enabling YAML support. Is that correct, or was updated constants #163 adding new constants for a different purpose? (I wasn't involved in adding the YAML support, so definitely defer to you and others on this.)
• In looking at this, it occurred to me that the README statement about "no requirements other than gordf" is no longer accurate. I just submitted docs: Remove outdated statement about requirements #180 to remove this statement, since it's probably worth fixing that for the release-tagged version.

Other than those, I'm good to give the +1 here. Thanks!

[lumjjb]

ahh you're right it was meant for the next line, fixed! Also merged your PR!

[lumjjb]

resolved the comments so merging this.