Fix erroneous details url from #2927

How ironic that I merged the tests to test exactly this right afterwards ...

repository/t.json

@@ -1334,7 +1334,7 @@
 			"releases": [
 				{
 					"sublime_text": "<3000",
-					"details": "https://github.com/alehandrof/Typewriter/st2"
+					"details": "https://github.com/alehandrof/Typewriter/tree/st2"
 				},
 				{
 					"sublime_text": ">=3000",