Fix /bytes endpoint with newer werkzeug versions #41
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At some point, werkzeug starting checking the inputs to the write() method, which caused the following traceback:
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/werkzeug/serving.py", line 364, in run_wsgi
execute(self.server.app)
File "/usr/lib/python3/dist-packages/werkzeug/serving.py", line 328, in execute
write(data)
File "/usr/lib/python3/dist-packages/werkzeug/serving.py", line 296, in write
assert isinstance(data, bytes), "applications must write bytes"
AssertionError: applications must write bytes
Fix this by using bytes instead of bytearray.