Update setup.sh

Add dependencies checks

setup.sh

@@ -1,10 +1,16 @@
 #!/bin/sh
-gem install wpscan
+
+[ ! $(which gem) ] && echo "gem not found in this system. Exiting." && exit 1
+$(which gem) install wpscan
 wpscan --update
+
+[ ! $(which python3) ] && echo "python3 not found in this system. Exiting." && exit 1
 python3 -m pip install virtualenv
 virtualenv venv -p python3
 . venv/bin/activate
 pip install --no-cache-dir -r requirements.txt
+
+[ ! $(which git) ] && echo "git not found in this system. Exiting." && exit 1
 git submodule update --init --recursive
 cd plugins/vbscan/ && git pull origin master
-cd ../joomscan/ && git pull origin master
+cd ../joomscan/ && git pull origin master