re-run github-backers: drops invalid contributors

package.json

@@ -100,10 +100,8 @@
     "Benjamin Lupton <b@lupton.cc> (https://balupton.com) (https://github.com/balupton)",
     "Ian Sibner <sibnerian@gmail.com> (https://sibnerian.com) (https://github.com/sibnerian)",
     "Kukhyeon Heo <sainthkh@gmail.com> (https://github.com/sainthkh)",
-    "Michael Duane Mooring <mike@mdm.cc> (https://mdm.cc) (https://github.com/mikeumus) (https://opencollective.com/mikeumus) (https://twitter.com/mikeumus)",
-    "Rob Loach <robloach@gmail.com> (https://github.com/robloach)",
     "Sean <sean@albinodrought.com> (https://albinodrought.com) (https://github.com/AlbinoDrought)",
-    "shinnn <snnskwtnb@gmail.com> (https://qiita.com/shinnn) (https://github.com/shinnn)"
+    "shinnn (https://qiita.com/shinnn) (https://github.com/shinnn)"
   ],
   "sponsors": [
     "Andrew Nesbitt (https://nesbitt.io) (https://github.com/andrew): Software engineer and researcher",