chore(package): update dependencies

Author: gr2m

package.json

@@ -4,7 +4,8 @@
   "main": "index.js",
   "scripts": {
     "semantic-release": "semantic-release pre && npm publish && semantic-release post",
-    "test": "standard && npm run -s test:node | tap-spec",
+    "pretest": "standard",
+    "test": "npm run -s test:node | tap-spec",
     "test:coverage": "istanbul cover tests",
     "test:coverage:upload": "istanbul-coveralls",
     "test:node": "node tests"
@@ -25,10 +26,10 @@
   },
   "homepage": "https://github.com/gr2m/hapi-cors-headers#readme",
   "devDependencies": {
-    "istanbul": "^0.3.17",
+    "istanbul": "^0.4.2",
     "istanbul-coveralls": "^1.0.3",
-    "semantic-release": "^4.0.0",
-    "standard": "^4.5.4",
+    "semantic-release": "^6.2.0",
+    "standard": "^6.0.8",
     "tap-spec": "^4.0.2",
     "tape": "^4.0.1"
   }