fix a json syntax error :(

catb0t · catb0t · commit 19aac7fd5b89 · 2016-10-20T09:02:28.000-04:00
diff --git a/package.json b/package.json
@@ -16,7 +16,7 @@
     "have_ulong64.c",
     "test_fnv.c",
     "WHATS-THIS.md"
-  ]
+  ],
 
   "install": "make install"
 }
