add deprecation notice

[Rich-Harris]

tl;dr: I'm proposing that this project be considered inactive, in favour of Rollup and Babel. This PR contains 0.7.5, with the deprecation notice plus a couple of recent fixes

Version 0.8 of Esperanto will use Rollup for bundling, rather than Esperanto itself (see #184). People who want the most up-to-date version of Rollup should use Rollup directly, rather than via Esperanto.

Which leaves the question of what this project is for. Esperanto can do one-to-one module transformations, but my guess is that the number of people who need to do that but aren't already using Babel is rather small. Since Babel can also transform ES6 modules to AMD, CommonJS and UMD (and SystemJS!), there's really no need to use both.

Since I intend to continue working on Rollup, and think it has a brighter future than Esperanto, I think this project should basically be abandoned.

TODO:

• [x] Improve Rollup documentation (including a 'migrating from Esperanto' page?)
• [ ] Create a Rollup website?

Thoughts? @eventualbuddha / @stefanpenner / anyone

[stefanpenner]

thanks for the headsup, we have our transition plan!

[jamesplease]

:cry: c u esperanto