lint: apply standard 13 style

Author: dougwilson

.travis.yml

@@ -59,7 +59,7 @@ before_install:
   # Setup Node.js version-specific dependencies
   - |
     # Configure eslint for linting
-    if node_version_lt '6.0'; then npm_remove_module_re '^eslint(-|$)'
+    if node_version_lt '8.0'; then npm_remove_module_re '^eslint(-|$)'
     fi
   - |
     # Configure istanbul for coverage

package.json

@@ -14,11 +14,11 @@
   },
   "devDependencies": {
     "after": "0.8.2",
-    "eslint": "5.16.0",
-    "eslint-config-standard": "12.0.0",
-    "eslint-plugin-import": "2.18.0",
+    "eslint": "6.0.1",
+    "eslint-config-standard": "13.0.1",
+    "eslint-plugin-import": "2.18.2",
     "eslint-plugin-markdown": "1.0.0",
-    "eslint-plugin-node": "8.0.1",
+    "eslint-plugin-node": "9.1.0",
     "eslint-plugin-promise": "4.2.1",
     "eslint-plugin-standard": "4.0.0",
     "istanbul": "0.4.5",