chore(package): update dev dependencies to latest version

Author: tiagoschenkel

package.json

@@ -68,7 +68,7 @@
   },
   "devDependencies": {
     "@types/bluebird": "^3.5.24",
-    "@types/chai": "^4.1.4",
+    "@types/chai": "^4.1.5",
     "@types/mocha": "^5.2.5",
     "@types/sinon": "^5.0.2",
     "bluebird": "^3.5.2",
@@ -96,22 +96,22 @@
     "karma-webpack": "^3.0.5",
     "mocha": "^5.2.0",
     "nyc": "^13.0.1",
-    "prettier": "^1.14.2",
+    "prettier": "^1.14.3",
     "publish-please": "^3.2.0",
     "reflect-metadata": "^0.1.12",
     "remap-istanbul": "^0.12.0",
     "rimraf": "^2.6.2",
-    "sinon": "^6.3.3",
+    "sinon": "^6.3.4",
     "sinon-chai": "^3.2.0",
     "source-map-support": "^0.5.9",
-    "ts-loader": "^5.1.1",
+    "ts-loader": "^5.2.0",
     "ts-node": "^7.0.1",
     "tslint": "^5.11.0",
     "tslint-config-prettier": "^1.15.0",
     "typescript": "^3.0.3",
-    "uglifyjs-webpack-plugin": "^2.0.0",
-    "webpack": "^4.19.0",
-    "webpack-cli": "^3.1.0",
-    "webpack-dev-server": "^3.1.8"
+    "uglifyjs-webpack-plugin": "^2.0.1",
+    "webpack": "^4.20.1",
+    "webpack-cli": "^3.1.1",
+    "webpack-dev-server": "^3.1.9"
   }
 }