Travis: also test on 32-bit Linux

diff --git a/RelNotes b/RelNotes
index 05324e4d7f0e0d50672030c3ba9ba2f2f0703c13..7f250ddc2efa8f8d3a46ccecb4d810695387798a 120000 (symlink)
--- a/RelNotes
+++ b/RelNotes
@@ -1 +1 @@
-Documentation/RelNotes/1.7.11.2.txt
\ No newline at end of file
+Documentation/RelNotes/2.11.1.txt
\ No newline at end of file