Fix bug with html templates and non-ascii

This arises when a date substitution uses a localised month name with
accents such as the German for March.

Signed-off-by: Jim Easterbrook <jim@jim-easterbrook.me.uk>

src/pywws/Template.py

@@ -3,7 +3,7 @@
 
 # pywws - Python software for USB Wireless Weather Stations
 # http://github.com/jim-easterbrook/pywws
-# Copyright (C) 2008-16  pywws contributors
+# Copyright (C) 2008-17  pywws contributors
 
 # This program is free software; you can redistribute it and/or
 # modify it under the terms of the GNU General Public License
@@ -442,7 +442,10 @@ def jump(idx, count):
                             fmt = fmt.encode(file_encoding)
                         x = x.strftime(fmt)
                         if sys.version_info[0] < 3:
-                            x = x.decode(file_encoding)
+                            if self.encoding == 'html':
+                                x = x.decode('ascii', errors='xmlcharrefreplace')
+                            else:
+                                x = x.decode(file_encoding)
                         yield x
                     elif not use_locale:
                         yield fmt % (x)

src/pywws/__init__.py

@@ -1,3 +1,3 @@
-__version__ = '17.02.0'
-_release = '1373'
-_commit = '73907d3'
+__version__ = '17.03.0'
+_release = '1374'
+_commit = '2d2dbf4'