v0.3.0: prepare new release

[behackl]

Preparations for new release:

• Version number bump (to v0.3.0)
• Include list of changes since v0.2.0

For the sake of documentation, here is what I did to get to this changelog:

1. git log --format="- %s" --first-parent 8a673946.. > changelog, this creates a file changelog with one line per commit on master
2. Regex-replacement:

   - (.+) \(#(\d+)\)$
   

   to

   - :pr:`$2`: $1
   

3. Fix possibly remaining Merge pull request ... from non-squish merges and make them consistent with other entries
4. Go through the list from bottom to top, classify into Breaking Changes, New Features, Bugfixes and Enhancements, some messages were prefixed by Bugfix:, etc. -- delete these in favor of placement in correct category.
5. Look through list and add references/code literals wherever it makes sense.

[eulertour]

Shouldn't this be 0.3.0? We didn't do a mid-month release.

[jsonvillanueva]

If we're using semantic versioning, then points 4, 6 and 7 are useful references. I think this release adds a few new backwards compatible features and would justify bumping the minor instead. Perhaps future month releases will only involve bug fixes/patches, but I foresee many minor bumps as we add new features each month to the core (I'm calling it here, 0.11.2 -> 1.0.0 -- only half joking)

[behackl]

As long as our major version is still 0, that doesn't really apply though necessarily. That being said, I'd be fine with bumping to v0.3.0 (although I was thinking of moving to v0.3.0 only with the switch to the webgl renderer).

[behackl]

From the discussion on Discord it seems that people are either neutral or leaning towards v0.3.0 -- so let's adhere to semantic versioning, respect that we've introduced new, backwards-compatible features, and let's go with v0.3.0. I'm pushing another commit.

[naveen521kk]

@behackl Do you have any ideas of using https://github.com/twisted/towncrier?

[behackl]

@behackl Do you have any ideas of using https://github.com/twisted/towncrier?

No, and I don't really see a reason for using it.