Bump diff from 1.0.8 to 3.5.0

Bumps [diff](https://github.com/kpdecker/jsdiff) from 1.0.8 to 3.5.0.
- [Release notes](https://github.com/kpdecker/jsdiff/releases)
- [Changelog](https://github.com/kpdecker/jsdiff/blob/master/release-notes.md)
- [Commits](kpdecker/jsdiff@v1.0.8...v3.5.0)

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

Author: dependabot[bot]

package-lock.json

@@ -23,7 +23,7 @@
         "atma-utils": "^0.2.58",
         "benchmark": "^1.0.0",
         "body-parser": "~1.4.3",
-        "diff": "~1.0.8",
+        "diff": "~3.5.0",
         "domtest": "^0.10.34",
         "includejs": "^0.15.52",
         "jquery": "^2.1.4",