Remove unneeded dev-dependency

Author: wooorm

package.json

@@ -39,7 +39,6 @@
   "devDependencies": {
     "@types/tape": "^4.0.0",
     "c8": "^7.0.0",
-    "dtslint": "^4.0.0",
     "prettier": "^2.0.0",
     "remark-cli": "^10.0.0",
     "remark-preset-wooorm": "^9.0.0",