ValueError when refreshing token

[dylanlingelbach]

When base.py tries to refresh a token upon a 401 error, a ValueError is raised because the syntax for log message format is incorrect.

Line 181 should read:

self.log.info('Retrying with new token %s' % (self.access_token))

not

self.log.info('Retrying with new token %' % (self.access_token))

The stack trace for the error is:

Traceback (most recent call last):
  <Our code elided>
  File "/Users/dylanl/Code/core/core-env/src/hapipy-master/hapi/workflows.py", line 34, in enroll_contact
  File "/Users/dylanl/Code/core/core-env/src/hapipy-master/hapi/base.py", line 209, in _call
    result = self._call_raw(subpath, params=params, method=method, data=data, doseq=doseq, query=query, retried=False, **options)
  File "/Users/dylanl/Code/core/core-env/src/hapipy-master/hapi/base.py", line 182, in _call_raw
    self.log.info('Retrying with new token %' % (self.access_token))
ValueError: incomplete format

I can create a PR if needed. My fork has a few other changes that aren't ready to merge and the change is so trivial I figured a PR would be overkill.