Bump async from 2.6.3 to 2.6.4

Bumps [async](https://github.com/caolan/async) from 2.6.3 to 2.6.4.
- [Release notes](https://github.com/caolan/async/releases)
- [Changelog](https://github.com/caolan/async/blob/v2.6.4/CHANGELOG.md)
- [Commits](https://github.com/caolan/async/compare/v2.6.3...v2.6.4)

---
updated-dependencies:
- dependency-name: async
  dependency-type: direct:production
...

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

package-lock.json

@@ -19,9 +19,9 @@
             "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI="
         },
         "async": {
-            "version": "2.6.3",
-            "resolved": "https://registry.npmjs.org/async/-/async-2.6.3.tgz",
-            "integrity": "sha512-zflvls11DCy+dQWzTW2dzuilv8Z5X/pjfmZOWba6TNIVDm+2UDaJmXSOXlasHKfNBs8oo3M0aT50fDEWfKZjXg==",
+            "version": "2.6.4",
+            "resolved": "https://registry.npmjs.org/async/-/async-2.6.4.tgz",
+            "integrity": "sha512-mzo5dfJYwAn29PeiJ0zvwTo04zj8HDJj0Mn8TD7sno7q12prdbnasKJHhkm2c1LgrhlJ0teaea8860oxi51mGA==",
             "requires": {
                 "lodash": "^4.17.14"
             }

package.json

@@ -17,7 +17,7 @@
     },
     "homepage": "https://github.com/tjsga/sga-website#readme",
     "dependencies": {
-        "async": "^2.6.1",
+        "async": "^2.6.4",
         "express": "^4.16.3",
         "gmail-send": "^1.2.14",
         "hbs": "^4.0.1",