build(deps): bump safe-buffer from 5.1.2 to 5.2.1 (#72)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package.json

@@ -11,7 +11,7 @@
   ],
   "repository": "jshttp/basic-auth",
   "dependencies": {
-    "safe-buffer": "5.1.2"
+    "safe-buffer": "5.2.1"
   },
   "devDependencies": {
     "eslint": "5.6.0",