chore(package): update all dependencies

packages/xo-server-transport-email/.travis.yml

@@ -1,8 +1,8 @@
 language: node_js
 node_js:
-  - 'stable'
-  - '6'
-  - '4'
+  - stable
+  - 6
+  - 4
 
 # Use containers.
 # http://docs.travis-ci.com/user/workers/container-based-infrastructure/

packages/xo-server-transport-email/package.json

@@ -36,15 +36,15 @@
     "promise-toolbox": "^0.7.0"
   },
   "devDependencies": {
-    "babel-cli": "^6.10.1",
-    "babel-eslint": "^7.0.0",
-    "babel-preset-latest": "^6.16.0",
-    "babel-preset-stage-0": "^6.5.0",
+    "babel-cli": "^6.18.0",
+    "babel-eslint": "^7.1.1",
+    "babel-preset-env": "^0.0.8",
+    "babel-preset-stage-0": "^6.16.0",
     "cross-env": "^3.1.3",
-    "dependency-check": "^2.5.1",
-    "ghooks": "^1.2.4",
+    "dependency-check": "^2.6.0",
+    "ghooks": "^1.3.2",
     "rimraf": "^2.5.4",
-    "standard": "^8.1.0"
+    "standard": "^8.5.0"
   },
   "scripts": {
     "build": "cross-env NODE_ENV=production babel --source-maps --out-dir=dist/ src/",
@@ -59,7 +59,14 @@
   },
   "babel": {
     "presets": [
-      "latest",
+      [
+        "env",
+        {
+          "targets": {
+            "node": 4
+          }
+        }
+      ],
       "stage-0"
     ]
   },