Add keyword to VSCode plugin

vscode/syntaxes/tree-sitter-graph.tmLanguage.json

···
 		"keywords": {
 			"patterns": [{
 				"name": "keyword.control.tsg",
-				"match": "^\\s*(attr|attribute|edge|for|global|if|let|node|none|print|scan|set|some|var)\\b"
+				"match": "^\\s*(attr|attribute|edge|for|global|if|inherit|let|node|none|print|scan|set|some|var)\\b"
 			}]
 		},
 		"functions": {