[conda] Add a test for display-annotations command

conda/meta.yaml

@@ -58,6 +58,7 @@ test:
   imports:
     - {{ name }}
   commands:
+    - bob bio display-face-annotations --help
     - nosetests --with-coverage --cover-package={{ name }} -sv {{ name }}
     - sphinx-build -aEW {{ project_dir }}/doc {{ project_dir }}/sphinx
     - sphinx-build -aEb doctest {{ project_dir }}/doc sphinx