Update CHANGES to reflect fix for #827

CHANGES

@@ -22,6 +22,7 @@ v2017.1-dev 2017-09-01
    #800: Inliner: Fix inlining function into header of multi-block loop
    #824: Eliminate-local-multi-store: Fix a crash
    #826: Elimiante-local-multi-store: Fix a crash
+   #827: Fix crash when compact-ids transform runs before another transform.
    #834: Add Cmake option to build the compressing codec. Off by default.
 
 v2017.0 2017-09-01