New upstream release

- Update debian/copyright
- Update disabled ostree-boot packaging for new systemd generator
- Add new ABI to symbols file

debian/changelog

@@ -1,3 +1,12 @@
+ostree (2017.6-1) UNRELEASED; urgency=medium
+
+  * New upstream release
+    - Update debian/copyright
+    - Update disabled ostree-boot packaging for new systemd generator
+    - Add new ABI to symbols file
+
+ -- Simon McVittie <smcv@debian.org>  Wed, 24 May 2017 20:50:51 +0100
+
 ostree (2017.5-1) experimental; urgency=high
 
   * New upstream release