feat(config): remove config.importPathPrefix warning

Author: h13i32maru

src/ESDoc.js

@@ -176,9 +176,7 @@ export default class ESDoc {
   }
 
   static _deprecatedConfig(config) {
-    if (config.importPathPrefix) {
-      console.log('[deprecated] config.importPathPrefix is deprecated. use esdoc-importpath-plugin(https://github.com/esdoc/esdoc-importpath-plugin)');
-    }
+    // do nothing
   }
 
   /**

src/Typedef/typedef.js

@@ -15,7 +15,6 @@
  * @property {boolean} [debug=false]
  * @property {string} [index="./README.md"]
  * @property {string} [package="./package.json"]
- * @property {string} [importPathPrefix=""]
  * @property {string[]} [styles=[]]
  * @property {string[]} [scripts=[]]
  * @property {{type: string, source: string, includes: string[], excludes: string[]}} test

test/fixture/package/esdoc.json

@@ -5,7 +5,6 @@
   "debug": false,
   "index": "./test/fixture/package/README.md",
   "package": "./test/fixture/package/package.json",
-  "importPathPrefix": "out",
   "title": "ESDoc Test Fixture",
   "test": {
     "type": "mocha",