Bump jest from 25.5.4 to 26.4.0 (#10)

Bumps [jest](https://github.com/facebook/jest) from 25.5.4 to 26.4.0.
- [Release notes](https://github.com/facebook/jest/releases)
- [Changelog](https://github.com/facebook/jest/blob/master/CHANGELOG.md)
- [Commits](https://github.com/facebook/jest/compare/v25.5.4...v26.4.0)

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

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

package.json

@@ -31,7 +31,7 @@
   "devDependencies": {
     "@babel/preset-env": "^7.7.7",
     "glob": "^7.1.6",
-    "jest": "^25.1.0",
+    "jest": "^26.4.0",
     "rollup": "^1.29.0",
     "standard": "^14.3.1"
   },