Bump underscore from 1.13.7 to 1.13.8

Bumps [underscore](https://github.com/jashkenas/underscore) from 1.13.7 to 1.13.8.
- [Commits](https://github.com/jashkenas/underscore/commits)

---
updated-dependencies:
- dependency-name: underscore
  dependency-version: 1.13.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

package.json

@@ -78,7 +78,7 @@
 		"systemjs": "6.15.1",
 		"tableexport": "5.2.0",
 		"tinymce": "8.3.2",
-		"underscore": "1.13.7",
+		"underscore": "1.13.8",
 		"unitegallery": "1.7.28",
 		"urijs": "1.19.11",
 		"xlsx": "0.18.5",

yarn.lock

@@ -6356,10 +6356,10 @@ unc-path-regex@^0.1.2:
   resolved "https://registry.npmjs.org/unc-path-regex/-/unc-path-regex-0.1.2.tgz"
   integrity sha1-5z3T17DXxe2G+6xrCufYxqadUPo=
 
-underscore@1.13.7:
-  version "1.13.7"
-  resolved "https://registry.yarnpkg.com/underscore/-/underscore-1.13.7.tgz#970e33963af9a7dda228f17ebe8399e5fbe63a10"
-  integrity sha512-GMXzWtsc57XAtguZgaQViUOzs0KTkk8ojr3/xAxXLITqf/3EMwxC0inyETfDFjH/Krbhuep0HNbbjI9i/q3F3g==
+underscore@1.13.8:
+  version "1.13.8"
+  resolved "https://registry.yarnpkg.com/underscore/-/underscore-1.13.8.tgz#a93a21186c049dbf0e847496dba72b7bd8c1e92b"
+  integrity sha512-DXtD3ZtEQzc7M8m4cXotyHR+FAS18C64asBYY5vqZexfYryNNnDc02W4hKg3rdQuqOYas1jkseX0+nZXjTXnvQ==
 
 undertaker-registry@^2.0.0:
   version "2.0.0"