Fix internal:add-to-project. (#2394)

readme/adding-to-project.md

@@ -8,15 +8,20 @@ Adding BLT to an existing project can be much more complex than simply creating
 Prerequisites:
 
 1. Ensure that your project directory structure is Acquia-cloud compatible by asserting that the Drupal root is in a top-level folder called `docroot`.
-1. You must **already user Composer to manage site dependencies**. If you don't, please see [Using Composer to manage Drupal site dependencies](https://www.drupal.org/docs/develop/using-composer/using-composer-to-manage-drupal-site-dependencies) and modify your project accordingly. 
+1. You must **already user Composer to manage site dependencies**. If you don't, please see [Using Composer to manage Drupal site dependencies](https://www.drupal.org/docs/develop/using-composer/using-composer-to-manage-drupal-site-dependencies) and modify your project accordingly.
 1. Ensure that your dependencies are all up to date via `composer update`. Assert that these updates do not break your project.
 
 To add BLT to a pre-existing Drupal project, do the following:
 
 1. `cd` into your existing project directory.
-1. Add BLT via composer:
+2. Set Composer's `minimum-stability` to `dev` and `prefer-stable` to `true`:
+
+        composer config minimum-stability dev
+        composer config prefer-stable true
+
+3. Add BLT via composer:
 
         composer require acquia/blt:^8.3 --no-update
         composer update
 
-1. Continue following instructions for step 2 and beyond in [Creating a new project with BLT](../INSTALL.md#creating-a-new-project-with-blt).
+4. Continue following instructions for step 2 and beyond in [Creating a new project with BLT](../INSTALL.md#creating-a-new-project-with-blt).

src/Robo/Commands/Blt/UpdateCommand.php

@@ -80,6 +80,7 @@ public function update() {
    * @return \Robo\Result
    */
   public function addToProject() {
+    $this->updateRootProjectFiles();
     $this->reInstallComposerPackages();
     $this->displayArt();
     $this->yell("BLT has been added to your project.");