patch 8.0.0880: Travis uses an old Ubuntu version

Problem:    Travis uses an old Ubuntu version.
Solution:   Switch from precise to trusty. (Ken Takata, closes #1897)
diff --git a/Filelist b/Filelist
index 5038e67..93a397d 100644
--- a/Filelist
+++ b/Filelist
@@ -134,6 +134,7 @@
 		src/testdir/bench*.in \
 		src/testdir/bench*.vim \
 		src/testdir/samples/*.txt \
+		src/testdir/if_ver*.vim \
 		src/proto.h \
 		src/proto/arabic.pro \
 		src/proto/blowfish.pro \