upgrade gtt

Author: kriskbx

yarn.lock

@@ -2073,11 +2073,7 @@ commander@2.8.x, commander@~2.8.1:
   dependencies:
     graceful-readlink ">= 1.0.0"
 
-commander@^2.14.1, commander@^2.2.0:
-  version "2.19.0"
-  resolved "https://registry.yarnpkg.com/commander/-/commander-2.19.0.tgz#f6198aa84e5b83c46054b94ddedbfed5ee9ff12a"
-
-"commander@github:kriskbx/commander.js":
+commander@^2.14.1, commander@^2.2.0, "commander@github:kriskbx/commander.js":
   version "2.19.0"
   resolved "https://codeload.github.com/kriskbx/commander.js/tar.gz/2275da95973c27e40e13a4195768947aa39672d0"