Bump @jspm/generator from 2.3.1 to 2.4.2 (#56)

Bumps [@jspm/generator](https://github.com/jspm/generator) from 2.3.1 to 2.4.2.
- [Release notes](https://github.com/jspm/generator/releases)
- [Commits](jspm/generator@2.3.1...2.4.2)

---
updated-dependencies:
- dependency-name: "@jspm/generator"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -2,7 +2,7 @@
   "name": "mapapp",
   "exports": "./src/mapapp.js",
   "devDependencies": {
-    "@jspm/generator": "^2.3.1",
+    "@jspm/generator": "^2.4.2",
     "mkdirp": "^1.0.4"
   }
 }