Update dev-dependencies

Author: wooorm

package.json

@@ -25,10 +25,10 @@
     "vfile-find-up": "^2.0.0"
   },
   "devDependencies": {
-    "execa": "^0.7.0",
+    "execa": "^0.8.0",
     "nlcst-to-string": "^2.0.0",
     "nyc": "^11.1.0",
-    "remark-cli": "^3.0.0",
+    "remark-cli": "^4.0.0",
     "remark-preset-wooorm": "^3.0.0",
     "retext": "^5.0.0",
     "rimraf": "^2.5.4",