refactor: minimum require webpack version is 3

BREAKING CHANGE: minimum require `nodejs` version is `3`

Author: alexander-akait

lib/loader.js

@@ -9,7 +9,6 @@ var compileExports = require("./compile-exports");
 
 
 module.exports = function(content, map) {
-	if(this.cacheable) this.cacheable();
 	var callback = this.async();
 	var query = loaderUtils.getOptions(this) || {};
 	var moduleMode = query.modules;

lib/localsLoader.js

@@ -9,7 +9,6 @@ var compileExports = require("./compile-exports");
 
 
 module.exports = function(content) {
-	if(this.cacheable) this.cacheable();
 	var callback = this.async();
 	var query = loaderUtils.getOptions(this) || {};
 	var moduleMode = query.modules;

package.json

@@ -34,6 +34,9 @@
     "should": "^11.1.2",
     "standard-version": "^4.0.0"
   },
+  "peerDependencies": {
+    "webpack": "^3.0.0 || ^4.0.0"
+  },
   "scripts": {
     "lint": "eslint lib test",
     "test": "mocha",