PLT-3482/PLT-3551/PLT-3552 Fixed some markdown list parsing (#3637)

* PLT-3552 Partially-fixed an invalid test case

* PLT-3551 Removed an invalid test case

* PLT-3482 Added a test case for multiple lists separated by text

* PLT-3482 Updated marked to fix multiple lists separated by text

webapp/package.json

@@ -16,7 +16,7 @@
     "jasny-bootstrap": "3.1.3",
     "jquery": "3.1.0",
     "keymirror": "0.1.1",
-    "marked": "mattermost/marked#bbba29c38ea5b498561202abc376998d84e746db",
+    "marked": "mattermost/marked#69736482dbad685c398a5eec33a59b5ab06057ac",
     "match-at": "0.1.0",
     "object-assign": "4.1.0",
     "perfect-scrollbar": "0.6.12",