improve pip module management

resources/requirements.txt

@@ -0,0 +1,9 @@
+setuptools
+requests>=2.21.0
+protobuf
+zeroconf>=0.24.4
+click
+bs4
+six
+tqdm
+websocket-client

resources/update.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+pip3cmd=$(compgen -ac | grep -E '^pip-?3' | sort -r | head -1)
+if [[ -z  $pip3cmd ]]; then     # pip3 not found
+    if python3 -m pip -V 2>&1 | grep -q -i "^pip " ; then     # but try other way
+        pip3cmd="python3 -m pip"
+fi
+
+if [[ ! -z  $pip3cmd ]]; then     # pip3 found
+    echo "-- Updating requirements :"
+    echo $($pip3cmd install -r requirements.txt)
+else
+    echo ""
+    echo "Error: Cound not found pip3 program to update python dependencies !"
+fi