Max diameter metric can't handle file with Unicode

[lyriccoder]

Files with errors: files.tar.gz Logs errors.csv.gz

[0crat]

@acheshkov/z please, pay attention to this issue

[0crat]

You @vitaly-protasov/z need to have one of these roles in order to do "Request order start": ARC, PO; I'm sorry to say this, but at the moment you've got no roles in this project

[Vitaly-Protasov]

Typical log looks like this:

`

,Traceback (most recent call last):
File ""./04-find-patterns.py"", line 99, in execute_python_code_in_parallel_thread
val = metric'make'.value(file)
File ""/hdd/aibolit/aibolit/aibolit/metrics/maxDiameter/max_diam_of_tree.py"", line 63, in value
tree = AST(filename).value()
File ""/hdd/aibolit/aibolit/aibolit/utils/ast.py"", line 20, in value
return parse(file.read())
File ""/usr/lib/python3.6/codecs.py"", line 321, in decode
(result, consumed) = self._buffer_decode(data, self.errors, final)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xb6 in position 353: invalid start byte
`

Hence, there is some problems in '/hdd/aibolit/aibolit/aibolit/utils/ast.py'

[acheshkov]

@0crat out

[0crat]

@0crat out (here)

@acheshkov Job gh:yegor256/aibolit#280 is not assigned, can't get performer