Update dev-dependencies

Author: wooorm

.github/workflows/main.yml

@@ -17,5 +17,5 @@ jobs:
     strategy:
       matrix:
         node:
-          - lts/erbium
+          - lts/fermium
           - node

package.json

@@ -46,13 +46,13 @@
     "mdast-util-from-markdown": "^1.0.0",
     "micromark-extension-math": "^2.0.0",
     "prettier": "^2.0.0",
-    "remark-cli": "^10.0.0",
+    "remark-cli": "^11.0.0",
     "remark-preset-wooorm": "^9.0.0",
     "rimraf": "^3.0.0",
     "tape": "^5.0.0",
     "type-coverage": "^2.0.0",
     "typescript": "^4.0.0",
-    "xo": "^0.49.0"
+    "xo": "^0.52.0"
   },
   "scripts": {
     "build": "rimraf \"{index,test}.d.ts\" && tsc && type-coverage",