Correct the usage of lodash (LeetCode-OpenSource#242)

Author: jdneo

package-lock.json

@@ -309,7 +309,7 @@
     "devDependencies": {
         "@types/fs-extra": "5.0.0",
         "@types/highlight.js": "^9.12.3",
-        "@types/lodash.kebabcase": "^4.1.5",
+        "@types/lodash": "^4.14.123",
         "@types/markdown-it": "0.0.7",
         "@types/mocha": "^2.2.42",
         "@types/node": "^7.0.43",
@@ -322,7 +322,6 @@
         "fs-extra": "^6.0.1",
         "highlight.js": "^9.15.6",
         "lodash": "^4.17.11",
-        "lodash.kebabcase": "^4.1.1",
         "markdown-it": "^8.4.2",
         "require-from-string": "^2.0.2",
         "vsc-leetcode-cli": "2.6.2"

package.json

@@ -1,7 +1,7 @@
 // Copyright (c) jdneo. All rights reserved.
 // Licensed under the MIT license.
 
-import kebabCase = require("lodash.kebabcase");
+import * as _ from "lodash";
 import { IProblem, langExt } from "../shared";
 
 export function genFileExt(language: string): string {
@@ -13,7 +13,7 @@ export function genFileExt(language: string): string {
 }
 
 export function genFileName(node: IProblem, language: string): string {
-    const slug: string = kebabCase(node.name);
+    const slug: string = _.kebabCase(node.name);
     const ext: string = genFileExt(language);
     return `${node.id}.${slug}.${ext}`;
 }