Updated markdown parser (#3465)

webapp/package.json

@@ -16,7 +16,7 @@
     "jasny-bootstrap": "3.1.3",
     "jquery": "2.2.3",
     "keymirror": "0.1.1",
-    "marked": "mattermost/marked#662c0d2997215f328eaa55eb33aaa445838b4479",
+    "marked": "mattermost/marked#12d2be4cdf54d4ec95fead934e18840b6a2c1a7b",
     "match-at": "0.1.0",
     "mattermost": "mattermost/mattermost-javascript#release-3.1",
     "object-assign": "4.1.0",