Update l.json

This package existed in the repository before, I'm not sure how but it somehow got removed. Adding it back.

http://stackoverflow.com/questions/19665615/sublime-text-text-list-of-open-files/

repository/l.json

@@ -556,6 +556,17 @@
 				}
 			]
 		},
+		{
+			"name": "ListOpenFiles",
+			"details": "https://github.com/rrg/ListOpenFiles",
+			"labels": ["File List"],
+			"releases": [
+				{
+					"sublime_text": "*",
+					"branch": "master"
+				}
+			]
+		},		
 		{
 			"name": "lispindent",
 			"details": "https://github.com/odyssomay/sublime-lispindent",