Bump google-closure-library from 20190819.0.0 to 20200315.0.0

Bumps [google-closure-library](https://github.com/google/closure-library) from 20190819.0.0 to 20200315.0.0.
- [Release notes](https://github.com/google/closure-library/releases)
- [Commits](google/closure-library@v20190819...v20200315)

---
updated-dependencies:
- dependency-name: google-closure-library
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -11,7 +11,7 @@
     "glob": "~7.1.4",
     "google-closure-compiler": "~20190819.0.0",
     "google-closure-deps": "^20210406.0.0",
-    "google-closure-library": "~20190819.0.0",
+    "google-closure-library": "~20200315.0.0",
     "gulp": "~4.0.2",
     "jasmine": "~3.4.0"
   },