Dependabot: Bump react-bootstrap from 1.3.0 to 1.5.1 (#223)

Bumps [react-bootstrap](https://github.com/react-bootstrap/react-bootstrap) from 1.3.0 to 1.5.1.
- [Release notes](https://github.com/react-bootstrap/react-bootstrap/releases)
- [Changelog](https://github.com/react-bootstrap/react-bootstrap/blob/master/CHANGELOG.md)
- [Commits](react-bootstrap/react-bootstrap@v1.3.0...v1.5.1)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Jessica White <me@jesswhite.co.uk>

package.json

@@ -33,7 +33,7 @@
     "npm": "^6.14.8",
     "perfume.js": "^5.3.0",
     "react": "^16.13.1",
-    "react-bootstrap": "^1.3.0",
+    "react-bootstrap": "^1.5.1",
     "react-dom": "^16.13.1",
     "react-ga": "^3.3.0",
     "react-sizeme": "^2.6.12",