[ci] fix typo in xcode12 travis script

diff --git a/.travis.yml b/.travis.yml
index 69fa985..933109c 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -33,7 +33,7 @@ matrix:
       os: osx
       osx_image: xcode12
       script:
-        -make test_lib_only_clean
+        - make test_lib_only_clean
     - name: "macOS (xcode10, noopt, nodeps)"
       language: shell
       os: osx