Add option to update

skeleton/project_codename.sh

@@ -1,10 +1,22 @@
 #!/bin/bash
+update=false
 script_dir=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
 if [ ! -d "${script_dir}/.venv" ]; then
     python3 -m venv "$script_dir/.venv"
 fi
 # shellcheck disable=1091
 source "$script_dir/.venv/bin/activate"
+while [ "${#}" -gt 0 ]
+do
+    case "${1}" in
+        '--update'|'-u')
+            shift
+            update=true
+            ;;
+    esac
+done
+if [ "${update}" == "true" ]; then
     pip install -r "$script_dir/requirements.txt" > /dev/null
     pip install "$script_dir/" > /dev/null
+fi
 __project_codename__.py "${@}"