postCreateProject not executing

[troymcginnis]

After running a fresh install of Sage with composer create-project roots/sage project dev-master, the postCreateProject interactive portion of the install process fails to execute anything.

Here's my output:

troymcginnis@Troys-MacBook-Pro:themes$ composer create-project roots/sage project dev-master
Installing roots/sage (dev-master de27307b820305302fe2c5defd4bbee4e02a1dc3)
  - Installing roots/sage (dev-master master)
    Cloning master

Created project in project
Loading composer repositories with package information
Installing dependencies (including require-dev) from lock file
  - Installing composer/installers (v1.4.0)
    Loading from cache

  - Installing paragonie/random_compat (v2.0.10)
    Loading from cache

  - Installing illuminate/contracts (v5.4.27)
    Loading from cache

  - Installing doctrine/inflector (v1.2.0)
    Loading from cache

  - Installing illuminate/support (v5.4.27)
    Loading from cache

  - Installing illuminate/container (v5.4.27)
    Loading from cache

  - Installing illuminate/events (v5.4.27)
    Loading from cache

  - Installing psr/log (1.0.2)
    Loading from cache

  - Installing symfony/debug (v3.3.6)
    Loading from cache

  - Installing symfony/finder (v3.3.6)
    Loading from cache

  - Installing illuminate/filesystem (v5.4.27)
    Loading from cache

  - Installing illuminate/view (v5.4.27)
    Loading from cache

  - Installing illuminate/config (v5.4.27)
    Loading from cache

  - Installing roots/sage-lib (9.0.0-beta.4)
    Loading from cache

  - Installing symfony/yaml (v3.3.6)
    Loading from cache

  - Installing hassankhan/config (0.10.0)
    Loading from cache

  - Installing brain/hierarchy (2.3.0)
    Loading from cache

  - Installing soberwp/controller (9.0.0-beta.4)
    Loading from cache

  - Installing symfony/polyfill-mbstring (v1.5.0)
    Loading from cache

  - Installing symfony/translation (v3.3.6)
    Loading from cache

  - Installing nesbot/carbon (1.22.1)
    Loading from cache

  - Installing symfony/process (v3.3.6)
    Loading from cache

  - Installing symfony/console (v3.3.6)
    Loading from cache

  - Installing illuminate/console (v5.4.27)
    Loading from cache

  - Installing roots/sage-installer (1.3.1)
    Loading from cache

  - Installing squizlabs/php_codesniffer (2.9.1)
    Loading from cache

paragonie/random_compat suggests installing ext-libsodium (Provides a modern crypto API that can be used to generate random bytes.)
illuminate/support suggests installing symfony/var-dumper (Required to use the dd function (~3.2).)
illuminate/filesystem suggests installing league/flysystem (Required to use the Flysystem local and FTP drivers (~1.0).)
illuminate/filesystem suggests installing league/flysystem-aws-s3-v3 (Required to use the Flysystem S3 driver (~1.0).)
illuminate/filesystem suggests installing league/flysystem-rackspace (Required to use the Flysystem Rackspace driver (~1.0).)
symfony/translation suggests installing symfony/config ()
symfony/console suggests installing symfony/event-dispatcher ()
symfony/console suggests installing symfony/filesystem ()
illuminate/console suggests installing guzzlehttp/guzzle (Required to use the ping methods on schedules (~6.0).)
illuminate/console suggests installing mtdowling/cron-expression (Required to use scheduling component (~1.0).)
Generating autoload files
Do you want to remove the existing VCS (.git, .svn..) history? [Y,n]? Y
> Roots\Sage\Installer\ComposerScript::postCreateProject
troymcginnis@Troys-MacBook-Pro:themes$

As you can see at the end of composer run, the postCreateProject generates no further output.

Thoughts?