Remove lint:md script

It fails with on the generated CHANGELOG.

Author: dcyriller

.travis.yml

@@ -19,7 +19,6 @@ before_install:
 script:
   - cat node_modules/ember-template-lint/package.json | grep \"version\"
   - yarn lint:js
-  - yarn lint:md
   - yarn test
 
 env:

package.json

@@ -19,9 +19,8 @@
   "scripts": {
     "changelog": "lerna-changelog",
     "lint:js": "eslint . --cache",
-    "lint:md": "prettylint ./*.md",
     "test": "mocha --recursive",
-    "format": "yarn prettier '**/*.{hbs,js,json,md,yml}' --write"
+    "format": "yarn prettier '**/*.{hbs,js,json,yml}' --write"
   },
   "repository": "[email protected]:dcyriller/ember-template-lint-plugin-prettier.git",
   "author": "Cyrille David <'[email protected]'>",
@@ -39,8 +38,7 @@
     "eslint-plugin-prettier": "^3.1.0",
     "lerna-changelog": "^0.8.2",
     "mocha": "^6.1.4",
-    "prettier": "^1.18.2",
-    "prettylint": "^1.0.0"
+    "prettier": "^1.18.2"
   },
   "engines": {
     "node": "8.* || >= 10.*"