Update AUTHORS and add release note

for Stein RC release

Change-Id: Ib2677ad0c3130c25d043b40e2ef72edcb6f968ae

AUTHORS

@@ -36,3 +36,8 @@ wangqi (wang.qi@99cloud.net)
 inspurericzhang (zhanglf01@inspur.com)
 baiwenteng (baiwenteng@inspur.com)
 chao liu (liuc@rc.inesa.com)
+lijunjie <lijunjie@cloudin.cn>
+Matt Riedemann <mriedem.os@gmail.com>
+huang.zhiping <huang.zhiping@99cloud.net>
+zhulingjie <easyzlj@gmail.com>
+Sean McGinnis <sean.mcginnis@gmail.com>

releasenotes/notes/3_0_0-6e899d137b33437c.yaml

@@ -0,0 +1,20 @@
+---
+features:
+  - |
+    Storlets now experimentally supports Python3 environment for user-code
+    execution. With this stuff, Storlets supports the new API
+    `X-Object-Meta-Storlet-Language-Version` that can be set by user with
+    a value like `3.5`.
+issues:
+  - |
+    The new Python3 execution has several restriction with minor versions
+    so it should be improved in the next release cycle.
+upgrade:
+  - |
+    To enable the new Python3 environment for Storlets users, administrator
+    must re-create the execution container image to include the py3 runtime
+    inside the container. This upgrade can work without downtime,
+    what administrators should do to upgrade is to push the image to their
+    own container registry.
+fixes:
+  - Other various minor bug fixes.