fix types

Author: stevemao

lib/rules/no-unescaped-entities.js

@@ -40,7 +40,26 @@ module.exports = {
       type: 'object',
       properties: {
         forbid: {
-          type: 'array'
+          type: 'array',
+          items: {
+            oneOf: [{
+              type: 'string'
+            }, {
+              type: 'object',
+              properties: {
+                char: {
+                  type: 'string'
+                },
+                alternatives: {
+                  type: 'array',
+                  uniqueItems: true,
+                  items: {
+                    type: 'string'
+                  }
+                }
+              }
+            }]
+          }
         }
       },
       additionalProperties: false