Updated Drupal to 8.6. This goes with the following updates because it's possible...

[yaffs-website] / vendor / bin / install-scenario

diff --git a/vendor/bin/install-scenario b/vendor/bin/install-scenario
new file mode 120000 (symlink)
index 0000000..6e6d417
--- /dev/null
+++ b/vendor/bin/install-scenario
@@ -0,0 +1 @@
+../g1a/composer-test-scenarios/scripts/install-scenario
\ No newline at end of file