Bump acorn from 5.5.3 to 5.7.4

dependabot[bot] · web-flow · commit 6a4847d6445e · 2020-03-16T04:16:06.000Z
Bumps [acorn](https://github.com/acornjs/acorn) from 5.5.3 to 5.7.4. - [Release notes](https://github.com/acornjs/acorn/releases) - [Commits](acornjs/acorn@5.5.3...5.7.4) Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/yarn.lock b/yarn.lock
@@ -31,8 +31,9 @@ acorn-globals@^4.1.0:
     acorn "^5.0.0"
 
 acorn@^5.0.0, acorn@^5.3.0:
-  version "5.5.3"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.5.3.tgz#f473dd47e0277a08e28e9bec5aeeb04751f0b8c9"
+  version "5.7.4"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.4.tgz#3e8d8a9947d0599a1796d10225d7432f4a4acf5e"
+  integrity sha512-1D++VG7BhrtvQpNbBzovKNc1FLGGEE/oGe7b9xJm/RFHMBeUaUGpluV9RLjZa47YFdPcDAenEYuq9pQPcMdLJg==
 
 ajv@^4.9.1:
   version "4.11.8"
