Install Prestissimo in Workspace

**Why we need this change?**

[Prestissimo](https://github.com/hirak/prestissimo) will enabled `composer` to install plugins in parallel.

**Source**

http://jackmcdade.com/blog/tired-of-waiting

docker-compose.yml

@@ -33,6 +33,7 @@ services:
           - INSTALL_LARAVEL_ENVOY=${WORKSPACE_INSTALL_LARAVEL_ENVOY}
           - INSTALL_LARAVEL_INSTALLER=${WORKSPACE_INSTALL_LARAVEL_INSTALLER}
           - INSTALL_DEPLOYER=${WORKSPACE_INSTALL_DEPLOYER}
+          - INSTALL_PRESTISSIMO=${WORKSPACE_INSTALL_PRESTISSIMO}
           - INSTALL_LINUXBREW=${WORKSPACE_INSTALL_LINUXBREW}
           - INSTALL_MC=${WORKSPACE_INSTALL_MC}
           - INSTALL_SYMFONY=${WORKSPACE_INSTALL_SYMFONY}