Bump acorn from 5.7.1 to 5.7.4 in /server/cn/home/dans/dplayer

Bumps [acorn](https://github.com/acornjs/acorn) from 5.7.1 to 5.7.4.
- [Release notes](https://github.com/acornjs/acorn/releases)
- [Commits](https://github.com/acornjs/acorn/compare/5.7.1...5.7.4)

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

server/cn/home/dans/dplayer/yarn.lock

@@ -20,8 +20,8 @@ acorn-jsx@^4.1.1:
     acorn "^5.0.3"
 
 acorn@^5.0.3, acorn@^5.6.0:
-  version "5.7.1"
-  resolved "https://registry.npmjs.org/acorn/-/acorn-5.7.1.tgz#f095829297706a7c9776958c0afc8930a9b9d9d8"
+  version "5.7.4"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.4.tgz#3e8d8a9947d0599a1796d10225d7432f4a4acf5e"
 
 ajv-keywords@^3.0.0:
   version "3.2.0"