Update .gitignore file

Author: JKRhb

.gitignore

@@ -5,12 +5,19 @@
 *.txt
 *.upload
 *~
-.refcache
 .tags
-.targets.mk
 /*-[0-9][0-9].xml
+/.*.mk
+/.gems/
+/.refcache
+/.venv/
+/.vscode/
+/lib
+/node_modules/
+/versioned/
+Gemfile.lock
 archive.json
-draft-jimenez-t2trg-mud-coap.xml
-lib
+draft-romann-iotops-mud-constrained.xml
+package-lock.json
 report.xml
-venv/
+!requirements.txt