fix: deadlink for twitter (#124)

markdown-link-check detect twitter link with 400 as return code
diff --git a/.dlc.json b/.dlc.json
index 2e3e67c..8814c29 100644
--- a/.dlc.json
+++ b/.dlc.json
@@ -5,6 +5,9 @@
     },
     {
       "pattern": "^https://img.shields.io/badge"
+    },
+    {
+      "pattern": "https://twitter.com/dolphinschedule"
     }
   ],
   "httpHeaders": [