Release v1.0.0

[thibaudcolas]

The v1.0.0 milestone is about to reach completion. Copy-paste fixes at #147 are the last big ticket item.

There probably will be a v0.18.0 release with the copy-paste fixes, and then if all goes well an identical v1.0.0 to denote that Draftail is now stable enough and Production-Ready™.

[thibaudcolas]

While we're at it, it might be a good opportunity to introduce a breaking change: re-reverting stripPastedStyles.

See https://github.com/springload/draftail/blob/master/CHANGELOG.md#v050:

• Copy/paste of rich text is now configurable via the stripPastedStyles option.
• Copy/paste of rich text is now disabled by default. This will be enabled by default once it is better supported.

Edit: meh, I'm not sure it's really worth the breaking change and potential issues for people.

[thibaudcolas]

I'm waiting for Wagtail 2.2 to ship with the latest version, and if nothing is raised from this then it will be time for Draftail 1.0.0.