upgrade dev deps (#10)

Author: justjavac

package.json

@@ -41,14 +41,14 @@
   },
   "devDependencies": {
     "codecov": "^3.5.0",
-    "cross-env": "^5.2.0",
-    "husky": "^3.0.0",
-    "jest": "^24.8.0",
-    "lint-staged": "^9.2.0",
+    "cross-env": "^5.2.1",
+    "husky": "^3.0.5",
+    "jest": "^24.9.0",
+    "lint-staged": "^9.2.5",
     "memory-fs": "^0.4.1",
     "prettier": "^1.18.2",
-    "rimraf": "^2.6.3",
-    "webpack": "^4.35.0"
+    "rimraf": "^3.0.0",
+    "webpack": "^4.39.3"
   },
   "keywords": [
     "webpack",