dev/run_travis.sh in passenger-4.0.46 vs dev/run_travis.sh in passenger-4.0.48

@@ -1,5 +1,7 @@
 #!/bin/bash
+# This script is run by Travis, to execute tests in the CI environment.
+
 set -e
 
 export VERBOSE=1
 export TRACE=1
 export DEVDEPS_DEFAULT=no