chore: prepare release notes for 0.11.3

Midnighter · Midnighter · commit 4146d187e4e5 · 2018-03-07T18:04:01.000+01:00
diff --git a/release-notes/0.11.3.md b/release-notes/0.11.3.md
@@ -0,0 +1,10 @@
+# Release notes for cobrapy 0.11.3
+
+## Fixes
+
+* Improve convergence and stability of sampling.
+* Reverse inplace operations after leaving a context.
+
+## Docs
+
+* Better description of custom constraints.
