chore(deps): bump acorn in /packages/babel-plugin-transform-vue-jsx

Bumps [acorn](https://github.com/acornjs/acorn) from 6.0.4 to 6.4.1.
- [Release notes](https://github.com/acornjs/acorn/releases)
- [Commits](acornjs/acorn@6.0.4...6.4.1)

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

Author: dependabot[bot]

packages/babel-plugin-transform-vue-jsx/yarn.lock

@@ -769,6 +769,11 @@
   resolved "https://registry.yarnpkg.com/@types/node/-/node-10.12.12.tgz#e15a9d034d9210f00320ef718a50c4a799417c47"
   integrity sha512-Pr+6JRiKkfsFvmU/LK68oBRCQeEg36TyAbPhc2xpez24OOZZCuoIhWGTd39VZy6nGafSbxzGouFPTFD/rR1A0A==
 
+"@vue/babel-helper-vue-jsx-merge-props@^1.0.0":
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/@vue/babel-helper-vue-jsx-merge-props/-/babel-helper-vue-jsx-merge-props-1.0.0.tgz#048fe579958da408fb7a8b2a3ec050b50a661040"
+  integrity sha512-6tyf5Cqm4m6v7buITuwS+jHzPlIPxbFzEhXR5JGZpbrvOcp1hiQKckd305/3C7C36wFekNTQSxAtgeM0j0yoUw==
+
 "@vue/test-utils@^1.0.0-beta.26":
   version "1.0.0-beta.26"
   resolved "https://registry.yarnpkg.com/@vue/test-utils/-/test-utils-1.0.0-beta.26.tgz#1ae7e1dc2bef4f49f9dbfdfecad342d17d6c5c88"
@@ -801,9 +806,9 @@ acorn-walk@^6.0.1:
   integrity sha512-OtUw6JUTgxA2QoqqmrmQ7F2NYqiBPi/L2jqHyFtllhOUvXYQXf0Z1CYUinIfyT4bTCGmrA7gX9FvHA81uzCoVw==
 
 acorn@^6.0.1, acorn@^6.0.2:
-  version "6.0.4"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.0.4.tgz#77377e7353b72ec5104550aa2d2097a2fd40b754"
-  integrity sha512-VY4i5EKSKkofY2I+6QLTbTTN/UvEQPCo6eiwzzSaSWfpaDhOmStMCMod6wmuPciNq+XS0faCglFu2lHZpdHUtg==
+  version "6.4.1"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.4.1.tgz#531e58ba3f51b9dacb9a6646ca4debf5b14ca474"
+  integrity sha512-ZVA9k326Nwrj3Cj9jlh3wGFutC2ZornPNARZwsNYqQYgN0EsV2d53w5RN/co65Ohn4sUAUtb1rSUAOD6XN9idA==
 
 ajv@^6.5.5:
   version "6.6.1"