[Security] Bump tough-cookie from 2.3.2 to 2.3.4

dependabot-preview[bot] · web-flow · commit 7e42592a400f · 2019-06-03T22:17:02.000Z
Bumps [tough-cookie](https://github.com/salesforce/tough-cookie) from 2.3.2 to 2.3.4. **This update includes security fixes.** - [Release notes](https://github.com/salesforce/tough-cookie/releases) - [Commits](salesforce/tough-cookie@v2.3.2...v2.3.4)
diff --git a/yarn.lock b/yarn.lock
@@ -3932,8 +3932,8 @@ to-fast-properties@^1.0.1, to-fast-properties@^1.0.3:
   resolved "https://registry.yarnpkg.com/to-fast-properties/-/to-fast-properties-1.0.3.tgz#b83571fa4d8c25b82e231b06e3a3055de4ca1a47"
 
 tough-cookie@~2.3.0:
-  version "2.3.2"
-  resolved "https://registry.yarnpkg.com/tough-cookie/-/tough-cookie-2.3.2.tgz#f081f76e4c85720e6c37a5faced737150d84072a"
+  version "2.3.4"
+  resolved "https://registry.yarnpkg.com/tough-cookie/-/tough-cookie-2.3.4.tgz#ec60cee38ac675063ffc97a5c18970578ee83655"
   dependencies:
     punycode "^1.4.1"
 
