Require using Error objects as Promise rejection reasons (prefer-prom…

…ise-reject-errors)

Fixes: standard/standard#777

eslintrc.json

@@ -138,6 +138,7 @@
     "one-var": ["error", { "initialized": "never" }],
     "operator-linebreak": ["error", "after", { "overrides": { "?": "before", ":": "before" } }],
     "padded-blocks": ["error", "never"],
+    "prefer-promise-reject-errors": "error",
     "quotes": ["error", "single", { "avoidEscape": true, "allowTemplateLiterals": true }],
     "rest-spread-spacing": ["error", "never"],
     "semi": ["error", "never"],