add Six package (#6196)

repository/s.json

@@ -1778,6 +1778,22 @@
 				}
 			]
 		},
+		{
+			"name": "Six",
+			"description": "Advanced Vim emulation.",
+			"author": "Guillermo López-Anglada",
+			"homepage": "http://www.sublimesix.com",
+			"buy": "http://www.sublimesix.com/buy.html",
+			"details": "https://github.com/guillermooo/six",
+			"readme": "https://raw.githubusercontent.com/guillermooo/Six/master/README.md",
+			"labels": ["vim", "vi", "vintage", "vintageous", "emulation", "emulator", "editor emulation"],
+			"releases": [
+				{
+					"sublime_text": ">=3124",
+					"tags": true
+				}
+			]
+		},
 		{
 			"name": "Six - Future JavaScript Syntax",
 			"details": "https://github.com/matthewrobb/Six.tmLanguage",