Update .gitignore

Author: phumthep

.gitignore

@@ -120,5 +120,7 @@ user_inputs/*
 src/analysis/decom_files/*
 src/analysis/results/*
 scripts/scratch.py
-model_library/dummy_hydro/pownet_hydropower.csv
-model_library/thailand/pownet_cycle_map.json
+
+# Pownet generated files
+pownet_*.csv
+pownet_*.json