lint: apply standard 12 style

Author: dougwilson

.travis.yml

@@ -25,7 +25,7 @@ before_install:
   # Setup Node.js version-specific dependencies
   - |
     # eslint for linting
-    # - remove on Node.js < 4
+    # - remove on Node.js < 6
     if [[ "$(cut -d. -f1 <<< "$TRAVIS_NODE_VERSION")" -lt 6 ]]; then
       node -pe 'Object.keys(require("./package").devDependencies).join("\n")' | \
         grep -E '^eslint(-|$)' | \

package.json

@@ -14,13 +14,13 @@
     "safe-buffer": "5.1.1"
   },
   "devDependencies": {
-    "eslint": "4.19.1",
-    "eslint-config-standard": "11.0.0",
-    "eslint-plugin-import": "2.12.0",
+    "eslint": "5.6.0",
+    "eslint-config-standard": "12.0.0",
+    "eslint-plugin-import": "2.14.0",
     "eslint-plugin-markdown": "1.0.0-beta.6",
-    "eslint-plugin-node": "6.0.1",
-    "eslint-plugin-promise": "3.8.0",
-    "eslint-plugin-standard": "3.0.1",
+    "eslint-plugin-node": "7.0.1",
+    "eslint-plugin-promise": "4.0.1",
+    "eslint-plugin-standard": "4.0.0",
     "istanbul": "0.4.5",
     "mocha": "2.5.3"
   },