Upgrade dependencies

.eslintrc.js

@@ -27,6 +27,6 @@ module.exports = {
     // Allow reassigning properties of objects.
     'no-param-reassign': ['error', { props: false }],
 
-    'import/no-extraneous-dependencies': ['error', { 'devDependencies': ['gulpfile.js', 'gulp/**/*.js'] }]
+    'import/no-extraneous-dependencies': ['error', { devDependencies: ['gulpfile.js', 'gulp/**/*.js'] }],
   },
 };

package.json

@@ -52,10 +52,10 @@
     "@babel/core": "^7.4.5",
     "@babel/preset-env": "^7.4.5",
     "@rollup/plugin-babel": "^5.3.0",
-    "@rollup/plugin-commonjs": "^17.1.0",
-    "@rollup/plugin-node-resolve": "^11.2.0",
+    "@rollup/plugin-commonjs": "^19.0.0",
+    "@rollup/plugin-node-resolve": "^13.0.0",
     "autoprefixer": "^10.2.4",
-    "cssnano": "^4.1.10",
+    "cssnano": "^5.0.4",
     "eslint": "^7.5.0",
     "eslint-config-airbnb-base": "^14.0.0",
     "eslint-plugin-import": "^2.17.3",