v1.1.6 fails processing

[bs-jena]

1.1.6 fails stating

Applying preprocessor includes... Failed to apply preprocessor includes: decoding to str: need a bytes-like object, int found

The log says:

2019-10-08 14:33:52,839 |           flt.pandoc |    ERROR | Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/foliant/backends/base.py", line 72, in apply_preprocessor
    preprocessor_options
  File "/usr/local/lib/python3.7/site-packages/foliant/preprocessors/includes.py", line 944, in apply
    self.project_path.resolve()
  File "/usr/local/lib/python3.7/site-packages/foliant/preprocessors/includes.py", line 902, in process_includes
    nohead=options.get('nohead')
  File "/usr/local/lib/python3.7/site-packages/foliant/preprocessors/includes.py", line 654, in _process_include
    nohead
  File "/usr/local/lib/python3.7/site-packages/foliant/preprocessors/includes.py", line 287, in _cut_from_position_to_position
    r'^\#{1,6}\s+' + rf'{re.escape(from_heading)}\s*$',
  File "/usr/local/Cellar/python/3.7.4_1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/re.py", line 259, in escape
    pattern = str(pattern, 'latin1')
TypeError: decoding to str: need a bytes-like object, int found

Using the same MD sources, version 1.1.5 works successfully.