Upgrade to bugfix release 0.7.28.

frameworks/D/vibed/dub.json

@@ -3,7 +3,7 @@
   "description": "A simple vibe.d server application.",
   "copyright": "Copyright © 2015, jin",
   "authors": ["jin", "Sönke Ludwig"],
-  "dependencies": { "vibe-d": "~>0.7.27" },
+  "dependencies": { "vibe-d": "~>0.7.28" },
   "versions": ["VibeDefaultMain"],
   "targetType": "executable",
   "sourcePaths": [],

frameworks/D/vibed/dub.selections.json

@@ -2,7 +2,7 @@
 	"fileVersion": 1,
 	"versions": {
 		"memutils": "0.4.4",
-		"vibe-d": "0.7.27",
+		"vibe-d": "0.7.28",
 		"libevent": "2.0.1+2.0.16",
 		"openssl": "1.1.4+1.0.1g",
 		"libasync": "0.7.8",