add 1.13 release notes

Noah Evans · Noah Evans · commit 4763ca350ff0 · 2017-09-28T14:24:52.000-06:00
diff --git a/NEWS b/NEWS
@@ -1,3 +1,6 @@
+--- 1.13 ---
+New Features:
+ - Performance Monitoring: use --enable-performance-monitoring
 --- 1.12 ---
 New Features:
  - Pluggable allocators: use --with-alloc={base,chapel} to choose
