update CHANGES.txt in prep for RC3

tballison · tballison · commit 24cd1768c999 · 2018-04-20T13:32:13.000-04:00
diff --git a/CHANGES.txt b/CHANGES.txt
@@ -1,4 +1,4 @@
-Release 1.18 - ???
+Release 1.18 - 4/20/2018
 
    * Upgrade Jackson to 2.9.5 (TIKA-2634).
 
