Add missing contributors. (#251)

This is an automated commit.

Co-authored-by: chiselbot <[email protected]>

Author: chiselbot

include/contributors.json

@@ -60,6 +60,10 @@
       "login": "ekiwi-sifive",
       "html_url": "https://github.com/ekiwi-sifive"
     },
+    {
+      "login": "fabianschuiki",
+      "html_url": "https://github.com/fabianschuiki"
+    },
     {
       "login": "felixonmars",
       "html_url": "https://github.com/felixonmars"