build: Update module version to 19.0.1.0.3 and add a .gitignore file.

.gitignore

@@ -0,0 +1,15 @@
+# Python
+*.py[cod]
+__pycache__/
+*.so
+
+# Odoo
+*.po~
+*.pot~
+
+# Editor / System
+.DS_Store
+.vscode/
+*.swp
+*.swo
+*~

__manifest__.py

@@ -5,7 +5,7 @@
 
 {
     "name": "Stock Disallow Negative",
-    "version": "18.0.1.0.3",
+    "version": "19.0.1.0.3",
     "category": "Inventory, Logistic, Storage",
     "license": "AGPL-3",
     "summary": "Disallow negative stock levels by default",