patch 8.1.1976: Travis log always shows test output

Problem:    Travis log always shows test output.
Solution:   Change script to avoid if/else. (Ozaki Kiichi, closes #4892)
diff --git a/.travis.yml b/.travis.yml
index 9c184f3..4625bcf 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -142,12 +142,8 @@
       "${SRCDIR}"/vim --not-a-term -u NONE -S "${SRCDIR}"/testdir/if_ver-2.vim -c quit > /dev/null
       cat if_ver.txt
     fi
-  - |
-    if do_test make ${SHADOWOPT} ${TEST}; then
-      echo -en "travis_fold:end:test\\r\\033[0K"
-    else
-      exit 1
-    fi
+  - do_test make ${SHADOWOPT} ${TEST} && FOLD_MARKER=travis_fold
+  - echo -en "${FOLD_MARKER}:end:test\\r\\033[0K"
 
 
 # instead of a 2*2*8 matrix (2*os + 2*compiler + 8*env),