Bump acorn from 5.3.0 to 5.7.4

Bumps [acorn](https://github.com/acornjs/acorn) from 5.3.0 to 5.7.4.
- [Release notes](https://github.com/acornjs/acorn/releases)
- [Commits](acornjs/acorn@5.3.0...5.7.4)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Diff for: yarn.lock

@@ -307,14 +307,10 @@ acorn-jsx@^4.1.1:
   dependencies:
     acorn "^5.0.3"
 
-acorn@^5.0.0:
-  version "5.3.0"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.3.0.tgz#7446d39459c54fb49a80e6ee6478149b940ec822"
-
-acorn@^5.0.3, acorn@^5.4.1, acorn@^5.6.2, acorn@^5.7.1:
-  version "5.7.3"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.3.tgz#67aa231bf8812974b85235a96771eb6bd07ea279"
-  integrity sha512-T/zvzYRfbVojPWahDsE5evJdHb3oJoQfFbsrKM7w5Zcs++Tr257tia3BmMP8XYVjp1S9RZXQMh7gao96BlqZOw==
+acorn@^5.0.0, acorn@^5.0.3, acorn@^5.4.1, acorn@^5.6.2, acorn@^5.7.1:
+  version "5.7.4"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.4.tgz#3e8d8a9947d0599a1796d10225d7432f4a4acf5e"
+  integrity sha512-1D++VG7BhrtvQpNbBzovKNc1FLGGEE/oGe7b9xJm/RFHMBeUaUGpluV9RLjZa47YFdPcDAenEYuq9pQPcMdLJg==
 
 [email protected], address@^1.0.1:
   version "1.0.3"