Fix error under Cygwin Python:
File "/usr/lib/python3.4/encodings/cp1251.py", line 19, in encode
return codecs.charmap_encode(input,self.errors,encoding_table)[0]
UnicodeEncodeError: 'charmap' codec can't encode characters in position 0-1: character maps to <undefined>
<!DOCTYPE html>
<html>
<head>
<meta name=viewport content="width=device-width, initial-scale=1">
<meta charset="utf-8">
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Compiled on <tt class="docutils literal"><span class="pre">{date}</span></tt>
from rev <tt class="docutils literal">{rev}</tt>.
</p>
<p>{warn1}</p>
<p>{warn2}</p>
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