Fixed syntax error equals should be colon

defaults/main.yml

@@ -8,6 +8,6 @@ otree_fqdn: "otree.local"
 otree_repo: "https://gitlab.au.dk/otree/otree_example_apps.git"
 # https://gitlab+deploy-token-36:change-me@gitlab.au.dk/otree/test.git
 # https://docs.gitlab.com/ee/user/project/deploy_tokens/#git-clone-a-repository
-otree_admin_password='my_otree_admin_pw'
+otree_admin_password: 'my_otree_admin_pw'
 
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