Traceback (most recent call last):
  File "/build/httpbin/src/httpbin-0.7.0/test_httpbin.py", line 13, in <module>
    import httpbin
  File "/build/httpbin/src/httpbin-0.7.0/httpbin/__init__.py", line 3, in <module>
    from .core import *
  File "/build/httpbin/src/httpbin-0.7.0/httpbin/core.py", line 26, in <module>
    from . import filters
  File "/build/httpbin/src/httpbin-0.7.0/httpbin/filters.py", line 19, in <module>
    from decorator import decorator
ModuleNotFoundError: No module named 'decorator'
==> ERROR: A failure occurred in check().
    Aborting...