Update dependencies

Author: sun-zheng-an

package.json

@@ -24,13 +24,13 @@
   },
   "homepage": "https://github.com/sun-zheng-an/gulp-shell",
   "devDependencies": {
-    "chai": "^3.5.0",
-    "coveralls": "^2.11.16",
+    "chai": "^4.1.2",
+    "coveralls": "^3.0.0",
     "gulp": "^3.9.1",
     "istanbul": "^0.4.5",
-    "mocha": "^3.2.0",
+    "mocha": "^4.1.0",
     "mocha-lcov-reporter": "^1.3.0",
-    "standard": "^8.6.0",
+    "standard": "^10.0.3",
     "vinyl": "^2.1.0"
   },
   "dependencies": {