fix(package): update keytar to version 5.5.0

Closes #68

Author: greenkeeper[bot]

package.json

@@ -64,7 +64,7 @@
     "github": "^13.1.0",
     "inquirer": "^5.0.0",
     "inquirer-autocomplete-prompt": "^0.12.0",
-    "keytar": "^4.0.5",
+    "keytar": "^5.5.0",
     "moment-timezone": "^0.5.14",
     "open": "0.0.5",
     "textstyler": "^1.1.1"