Upgrade packages.

Author: trekhleb

package-lock.json

@@ -4,9 +4,10 @@
   "description": "Algorithms and data-structures implemented on JavaScript",
   "main": "index.js",
   "scripts": {
-    "lint": "eslint ./src/*",
+    "lint": "eslint ./src/**",
     "test": "jest",
-    "ci": "npm run lint && npm run test -- --coverage"
+    "coverage": "npm run test -- --coverage",
+    "ci": "npm run lint && npm run coverage"
   },
   "repository": {
     "type": "git",
@@ -33,17 +34,17 @@
   },
   "homepage": "https://github.com/trekhleb/javascript-algorithms#readme",
   "devDependencies": {
-    "@babel/cli": "^7.10.5",
-    "@babel/preset-env": "^7.10.4",
-    "@types/jest": "^26.0.7",
-    "eslint": "^7.5.0",
-    "eslint-config-airbnb": "^18.2.0",
-    "eslint-plugin-import": "^2.22.0",
-    "eslint-plugin-jest": "^23.18.2",
-    "eslint-plugin-jsx-a11y": "^6.3.1",
-    "eslint-plugin-react": "^7.20.3",
-    "husky": "^4.2.5",
-    "jest": "^26.1.0"
+    "@babel/cli": "^7.12.8",
+    "@babel/preset-env": "^7.12.7",
+    "@types/jest": "^26.0.16",
+    "eslint": "^7.14.0",
+    "eslint-config-airbnb": "^18.2.1",
+    "eslint-plugin-import": "^2.22.1",
+    "eslint-plugin-jest": "^24.1.3",
+    "eslint-plugin-jsx-a11y": "^6.4.1",
+    "eslint-plugin-react": "^7.21.5",
+    "husky": "^4.3.0",
+    "jest": "^26.6.3"
   },
   "dependencies": {}
 }