refactor: Use preferred command substitution syntax

Author: lpatino10

.utility/deploy-travis-wrapper.sh

@@ -4,7 +4,7 @@
 
 # output every 9 min to prevent a Travis timeout
 PID=$!
-while [[ `ps -p $PID | tail -n +2` ]]; do
+while [[ $(ps -p $PID | tail -n +2) ]]; do
   echo 'Deploying...'
   sleep 540
 done