re-enable versionsTest on Travis
diff --git a/tests/Makefile b/tests/Makefile
index 420b81e..5301785 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -27,6 +27,8 @@
 PYTHON?= python3
 TESTDIR := zstdtest
 
+.PHONY: default all clean versionsTest
+
 default: all
 
 all: versionsTest