add commitHash to cgmanifest

extensions/rust/cgmanifest.json

@@ -6,12 +6,13 @@
 				"git": {
 					"name": "language-rust",
 					"repositoryUrl": "https://github.com/zargony/atom-language-rust",
-					"commitHash": ""
+					"commitHash": "179f449a69182cae4fcdf644d59d842b7e445f89"
 				}
 			},
 			"license": "MIT",
+			"description": "The files syntaxes/rust.tmLanguage.json was derived from the Atom package https://atom.io/packages/language-rust.",
 			"version": "0.4.9"
 		}
 	],
 	"version": 1
-}
+}