remove dtslint workaround in favor of npx

Author: Jan Lohage

.gitignore

@@ -31,4 +31,3 @@ node_modules
 
 dist/
 .idea/
-dtslint-build/

package.json

@@ -15,7 +15,7 @@
     "release:major": "npm version major && npm publish",
     "changelog": "github_changelog_generator && git add CHANGELOG.md && git commit -am \"Updating changelog\"",
     "lint": "semistandard --fix",
-    "lint:types": "mkdirp dtslint-build && cd dtslint-build && echo '{\"devDependencies\":{\"dtslint\":\"^0.3.0\"},\"scripts\":{\"dtslint\":\"dtslint ../types\"}}' > package.json && npm install && npm run dtslint",
+    "lint:types": "npx dtslint types",
     "mocha": "mocha --opts mocha.opts",
     "coverage": "istanbul cover node_modules/mocha/bin/_mocha -- --opts mocha.opts",
     "test": "npm run lint && npm run lint:types && npm run coverage"