Avoid error when using composer behat -- --help (#166)

Author: danielbachhuber

bin/run-behat-tests

@@ -13,6 +13,12 @@ then
     exit 1;
 fi
 
+if [[ "$@" == *"--help"* ]]; then
+    vendor/bin/behat "$@"
+    ret=$?
+    exit $ret
+fi
+
 # Turn WP_VERSION into an actual number to make sure our tags work correctly.
 if [ "${WP_VERSION-latest}" = "latest" ]; then
 	export WP_VERSION=$(curl -s https://api.wordpress.org/core/version-check/1.7/ | jq -r ".offers[0].current")