update dev dependencies

package.json

@@ -54,15 +54,15 @@
     "visualization"
   ],
   "devDependencies": {
-    "@babel/core": "^7.11.4",
-    "@babel/preset-env": "^7.11.0",
-    "@babel/register": "^7.10.5",
+    "@babel/core": "^7.11.6",
+    "@babel/preset-env": "^7.11.5",
+    "@babel/register": "^7.11.5",
     "babel-eslint": "^10.1.0",
     "babel-loader": "^8.1.0",
-    "babel-plugin-add-module-exports": "^1.0.2",
+    "babel-plugin-add-module-exports": "^1.0.4",
     "babel-plugin-istanbul": "^6.0.0",
     "babel-plugin-transform-class-properties": "^6.24.1",
-    "date-fns": "^2.15.0",
+    "date-fns": "^2.16.1",
     "debounce": "^1.2.0",
     "esdoc": "^1.1.0",
     "esdoc-accessor-plugin": "^1.0.0",
@@ -71,11 +71,11 @@
     "esdoc-ecmascript-proposal-plugin": "^1.0.0",
     "esdoc-integrate-test-plugin": "^1.0.0",
     "esdoc-standard-plugin": "^1.0.0",
-    "eslint": "^7.7.0",
+    "eslint": "^7.9.0",
     "htmlhint": "^0.14.1",
     "in-publish": "^2.0.1",
     "jasmine-core": "^3.6.0",
-    "karma": "^5.1.1",
+    "karma": "^5.2.2",
     "karma-chrome-launcher": "3.1.0",
     "karma-coverage": "^2.0.3",
     "karma-coveralls": "^2.1.0",
@@ -84,14 +84,14 @@
     "karma-jasmine-matchers": "4.0.2",
     "karma-verbose-reporter": "0.0.6",
     "karma-webpack": "^4.0.2",
-    "lint-staged": "^10.2.11",
+    "lint-staged": "^10.3.0",
     "load-script": "^1.0.0",
     "pre-commit": "^1.2.2",
-    "terser-webpack-plugin": "^4.1.0",
+    "terser-webpack-plugin": "^4.2.0",
     "webpack": "^4.44.1",
     "webpack-cli": "^3.3.12",
     "webpack-dev-server": "^3.11.0",
-    "webpack-merge": "^5.1.2"
+    "webpack-merge": "^5.1.4"
   },
   "homepage": "https://github.com/katspaugh/wavesurfer.js",
   "pre-commit": "lint-js-html",