Update path

Author: baylesj

.travis_scripts/run-clang-format.sh

@@ -1,4 +1,4 @@
 #!/usr/bin/env bash
 
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
-python $DIR/run-clang-format.py -r $DIR/../src/**/ $DIR/../include/**/
+python $DIR/run-clang-format.py --clang-format-executable clang-format-9 -r $DIR/../src/**/ $DIR/../include/**/