Update dev-dependencies

Author: wooorm

package.json

@@ -36,17 +36,17 @@
   "types": "index.d.ts",
   "dependencies": {},
   "devDependencies": {
-    "@types/mdast": "^3.0.3",
+    "@types/mdast": "^3.0.0",
     "browserify": "^16.0.0",
-    "dtslint": "^2.0.0",
-    "nyc": "^14.0.0",
+    "dtslint": "^3.0.0",
+    "nyc": "^15.0.0",
     "prettier": "^1.0.0",
     "remark-cli": "^7.0.0",
     "remark-preset-wooorm": "^6.0.0",
     "tape": "^4.0.0",
     "tinyify": "^2.0.0",
     "unified": "^8.0.0",
-    "xo": "^0.25.0"
+    "xo": "^0.26.0"
   },
   "scripts": {
     "format": "remark . -qfo && prettier --write \"**/*.{js,ts}\" && xo --fix",