Bump rollup-plugin-typescript2 from 0.30.0 to 0.31.1 (#388)

Bumps [rollup-plugin-typescript2](https://github.com/ezolenko/rollup-plugin-typescript2) from 0.30.0 to 0.31.1.
- [Release notes](https://github.com/ezolenko/rollup-plugin-typescript2/releases)
- [Commits](ezolenko/rollup-plugin-typescript2@0.30.0...0.31.1)

---
updated-dependencies:
- dependency-name: rollup-plugin-typescript2
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

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

package.json

@@ -71,7 +71,7 @@
     "rollup-plugin-babel": "^4.3.3",
     "rollup-plugin-serve": "^1.0.1",
     "rollup-plugin-terser": "^7.0.0",
-    "rollup-plugin-typescript2": "^0.30.0",
+    "rollup-plugin-typescript2": "^0.31.1",
     "sinon": "^10.0.0",
     "typescript": "^4.2.3"
   }