build: eslint@6.1.0

.travis.yml

@@ -33,8 +33,8 @@ before_install:
     fi
   - |
     # eslint for linting
-    # - remove on Node.js < 6
-    if [[ "$(cut -d. -f1 <<< "$TRAVIS_NODE_VERSION")" -lt 6 ]]; then
+    # - remove on Node.js < 8
+    if [[ "$(cut -d. -f1 <<< "$TRAVIS_NODE_VERSION")" -lt 8 ]]; then
       node -pe 'Object.keys(require("./package").devDependencies).join("\n")' | \
         grep -E '^eslint(-|$)' | \
         xargs npm rm --save-dev

package.json

@@ -16,7 +16,7 @@
   },
   "devDependencies": {
     "after": "0.8.2",
-    "eslint": "5.16.0",
+    "eslint": "6.1.0",
     "eslint-plugin-markdown": "1.0.0",
     "istanbul": "0.4.5",
     "mocha": "5.2.0",