update dev dependencies

package.json

@@ -54,7 +54,7 @@
     "visualization"
   ],
   "devDependencies": {
-    "@babel/core": "^7.11.0",
+    "@babel/core": "^7.11.4",
     "@babel/preset-env": "^7.11.0",
     "@babel/register": "^7.10.5",
     "babel-eslint": "^10.1.0",
@@ -71,7 +71,7 @@
     "esdoc-ecmascript-proposal-plugin": "^1.0.0",
     "esdoc-integrate-test-plugin": "^1.0.0",
     "esdoc-standard-plugin": "^1.0.0",
-    "eslint": "^7.6.0",
+    "eslint": "^7.7.0",
     "htmlhint": "^0.14.1",
     "in-publish": "^2.0.1",
     "jasmine-core": "^3.6.0",
@@ -80,18 +80,18 @@
     "karma-coverage": "^2.0.3",
     "karma-coveralls": "^2.1.0",
     "karma-firefox-launcher": "^1.3.0",
-    "karma-jasmine": "3.3.1",
+    "karma-jasmine": "4.0.1",
     "karma-jasmine-matchers": "4.0.2",
     "karma-verbose-reporter": "0.0.6",
     "karma-webpack": "^4.0.2",
     "lint-staged": "^10.2.11",
     "load-script": "^1.0.0",
     "pre-commit": "^1.2.2",
-    "terser-webpack-plugin": "^3.0.8",
+    "terser-webpack-plugin": "^4.1.0",
     "webpack": "^4.44.1",
     "webpack-cli": "^3.3.12",
     "webpack-dev-server": "^3.11.0",
-    "webpack-merge": "^5.1.0"
+    "webpack-merge": "^5.1.2"
   },
   "homepage": "https://github.com/katspaugh/wavesurfer.js",
   "pre-commit": "lint-js-html",