updates c.json to include Charcoal color scheme; all tests pass

repository/c.json

@@ -508,6 +508,17 @@
 					"tags": true
 				}
 			]
+		},
+				{
+			"name": "Charcoal",
+			"details": "https://github.com/Dnld/charcoal-color-scheme",
+			"labels": ["color scheme"],
+			"releases": [
+				{
+					"sublime_text": "*",
+					"tags": true
+				}
+			]
 		},
 		{
 			"name": "Chatscript Syntax",