feat: add opencollective.com in supported web sites

Signed-off-by: Pierre-Yves Lapersonne <dev@pylapersonne.info>

Author: pylapp

sherlock_project/resources/data.json

@@ -1513,6 +1513,13 @@
     "urlMain": "https://nyaa.si/",
     "username_claimed": "blue"
   },
+  "Open Collective": {
+    "errorMsg": "Oops! Page not found",
+    "errorType": "message",
+    "url": "https://opencollective.com/{}",
+    "urlMain": "https://opencollective.com/",
+    "username_claimed": "pylapp"
+  },
   "OpenStreetMap": {
     "errorType": "status_code",
     "regexCheck": "^[^.]*?$",