Update ESLint and Prettier

package.json

@@ -46,28 +46,27 @@
     "@types/parsimmon": "^1.10.0",
     "@types/seedrandom": "^2.4.28",
     "@types/svgo": "^1.2.1",
-    "@typescript-eslint/eslint-plugin": "^1.13.0",
-    "@typescript-eslint/parser": "^1.13.0",
+    "@typescript-eslint/eslint-plugin": "^3.7.0",
+    "@typescript-eslint/parser": "^3.7.0",
     "ava": "^2.2.0",
     "codemirror": "^5.48.2",
     "cssnano": "^4.1.10",
-    "eslint": "^6.1.0",
-    "eslint-config-prettier": "^6.0.0",
+    "eslint": "^7.5.0",
+    "eslint-config-prettier": "^6.11.0",
     "esm": "^3.2.25",
     "mithril": "^2.0.3",
     "postcss": "^7.0.17",
     "postcss-import": "^12.0.1",
     "postcss-preset-env": "^6.7.0",
-    "prettier": "^1.18.2",
+    "prettier": "^2.0.5",
     "rollup": "^1.17.0",
     "rollup-plugin-json": "^4.0.0",
-    "rollup-plugin-replace": "^2.2.0",
     "rollup-plugin-terser": "^5.1.1",
     "rollup-plugin-typescript": "^1.0.1",
     "source-map-loader": "^0.2.4",
     "svgo": "^1.3.0",
-    "ts-node": "^8.3.0",
-    "typescript": "^3.5.3",
+    "ts-node": "^8.10.2",
+    "typescript": "^3.9.7",
     "webpack": "^4.38.0"
   },
   "engines": {
@@ -75,11 +74,10 @@
   },
   "scripts": {
     "test": "ava --verbose --color",
-    "lint-ln": "find bin -type f -exec sh -c 'ln -fs \"$(sh -c pwd)/$1\" \"bin/.${1#bin/}.ts\"' _ {} \\;; find tools -type f -exec sh -c 'ln -fs \"$(sh -c pwd)/$1\" \"tools/.${1#tools/}.ts\"' _ {} \\;",
-    "lint-eslint": "eslint --fix \"bin/**/*.ts\" \"lib/**/*.ts\" \"ui/**/*.ts\" \"test/**/*.ts\" \"build/**/*.ts\" \"tools/**/*.ts\"",
+    "lint-eslint": "eslint --fix \"bin/*.ts\" \"lib/**/*.ts\" \"ui/**/*.ts\" \"test/**/*.ts\" \"build/**/*.ts\" \"tools/*.ts\"",
     "lint-prettier": "prettier --parser typescript --write \"bin/**/*.ts\" \"lib/**/*.ts\" \"ui/**/*.ts\" \"test/**/*.ts\" \"build/**/*.ts\" \"tools/**/*.ts\"",
     "lint-tsc": "tsc --noEmit",
-    "lint": "npm run lint-ln && npm run lint-eslint && npm run lint-prettier && npm run lint-tsc",
+    "lint": "npm run lint-eslint && npm run lint-prettier && npm run lint-tsc",
     "build": "node -r esm -r ts-node/register/transpile-only build/build"
   }
 }