channel: add deprecation message (#78)

The Channel API feature has been deprecated and is going to be removed.
See the Channel API Turndown document for details and timetable.

https://cloud.google.com/appengine/docs/deprecations/channel
1 file changed
tree: f4bc3f7f6be7b11fcb586c058257ddd10f96b29a
  1. aetest/
  2. blobstore/
  3. capability/
  4. channel/
  5. cloudsql/
  6. cmd/
  7. datastore/
  8. delay/
  9. demos/
  10. file/
  11. image/
  12. internal/
  13. log/
  14. mail/
  15. memcache/
  16. module/
  17. remote_api/
  18. runtime/
  19. search/
  20. socket/
  21. taskqueue/
  22. urlfetch/
  23. user/
  24. xmpp/
  25. .travis.yml
  26. appengine.go
  27. appengine_test.go
  28. appengine_vm.go
  29. CONTRIBUTING.md
  30. errors.go
  31. identity.go
  32. LICENSE
  33. namespace.go
  34. namespace_test.go
  35. README.md
  36. timeout.go