Enforce 1 newline at end of file (previously 1 or 2 were allowed)

Fixes: standard/standard#733

eslintrc.json

@@ -92,7 +92,7 @@
     "no-mixed-spaces-and-tabs": "error",
     "no-multi-spaces": "error",
     "no-multi-str": "error",
-    "no-multiple-empty-lines": ["error", { "max": 1 }],
+    "no-multiple-empty-lines": ["error", { "max": 1, "maxEOF": 0 }],
     "no-negated-in-lhs": "error",
     "no-new": "error",
     "no-new-func": "error",