Added Syntax Highlighting for Barrelfish's Mackerel (#6325)

* added mackerel syntax highlighting

* Switched to Tags

Switched to tags instead of branch based (since that is depricated)

* revised sublime_text

changed from >=3000 to >=3092

repository/m.json

@@ -45,6 +45,16 @@
 				}
 			]
 		},
+		{
+			"name": "Mackerel Syntax Highlighting",
+			"details": "https://github.com/Phillip3/mackerel_syntax_highlighting",
+			"releases": [
+				{
+					"sublime_text": ">=3092",
+					"tags": true
+				}
+			]
+		},
 		{
 			"name": "Macroptimize",
 			"details": "https://github.com/bigcakes/Macroptimize",