Update CHANGES.txt

ndmitchell · web-flow · commit 5709133ac65d · 2019-06-26T10:12:26.000+01:00
diff --git a/CHANGES.txt b/CHANGES.txt
@@ -1,5 +1,6 @@
 Changelog for HLint (* = breaking change)
 
+    #681, fix for extensions on the command line not being used
     #686, suggest head (drop n x) ==> x !! max 0 n
     #683, add Use DerivingStrategies hint, ignored by default
     #685, skip running refactoring tool if there are no hints
