remove older gzip size calculation

Author: developit

package.json

@@ -14,10 +14,9 @@
     "lint": "eslint src test --ext ts --ext js",
     "test": "tsc src/index.ts --noEmit && npm run lint && npm run testonly",
     "bundle": "microbundle",
-    "build": "npm-run-all --silent clean -p bundle -s docs size",
+    "build": "npm-run-all --silent clean -p bundle -s docs",
     "clean": "rimraf dist",
     "docs": "documentation readme src/index.ts --section API -q --parse-extension ts",
-    "size": "echo \"Gzipped Size: $(strip-json-comments --no-whitespace $npm_package_main | gzip-size | pretty-bytes)\"",
     "release": "npm run build -s && npm run bump && git push --follow-tags origin master && npm publish"
   },
   "repository": "developit/mitt",
@@ -70,16 +69,13 @@
     "documentation": "^13.0.0",
     "eslint": "^6.5.1",
     "esm": "^3.2.25",
-    "gzip-size-cli": "^1.0.0",
     "microbundle": "^0.12.0",
     "mocha": "^3.2.0",
     "npm-run-all": "^2.1.1",
-    "pretty-bytes-cli": "^2.0.0",
     "rimraf": "^2.5.2",
     "sinon": "^1.17.4",
     "sinon-chai": "^2.8.0",
     "standard-version": "^4.0.0",
-    "strip-json-comments-cli": "^1.0.1",
     "ts-node": "^8.10.1",
     "typescript": "^3.9.3"
   }