Bump underscore from 1.13.6 to 1.13.8 in /lib

Bumps [underscore](https://github.com/jashkenas/underscore) from 1.13.6 to 1.13.8.
- [Commits](jashkenas/underscore@1.13.6...1.13.8)

---
updated-dependencies:
- dependency-name: underscore
  dependency-version: 1.13.8
  dependency-type: indirect
...

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

Author: dependabot[bot]

lib/yarn.lock

@@ -4114,9 +4114,9 @@ uglify-js@^3.7.7:
   integrity sha512-T9q82TJI9e/C1TAxYvfb16xO120tMVFZrGA3f9/P4424DNu6ypK103y0GPFVa17yotwSyZW5iYXgjYHkGrJW/g==
 
 underscore@~1.13.2:
-  version "1.13.6"
-  resolved "https://registry.yarnpkg.com/underscore/-/underscore-1.13.6.tgz#04786a1f589dc6c09f761fc5f45b89e935136441"
-  integrity sha512-+A5Sja4HP1M08MaXya7p5LvjuM7K6q/2EaC0+iovj/wOcMsTzMvDFbasi/oSapiwOlt252IqsKqPjCl7huKS0A==
+  version "1.13.8"
+  resolved "https://registry.yarnpkg.com/underscore/-/underscore-1.13.8.tgz#a93a21186c049dbf0e847496dba72b7bd8c1e92b"
+  integrity sha512-DXtD3ZtEQzc7M8m4cXotyHR+FAS18C64asBYY5vqZexfYryNNnDc02W4hKg3rdQuqOYas1jkseX0+nZXjTXnvQ==
 
 unique-filename@^2.0.0:
   version "2.0.1"