Merge tag 'vv3.50.0' into develop

added marker/fill wrapper support to make coloring easier and improved ansi (color) shell detection support vv3.50.0

# gpg: Signature made Tue Mar  3 01:21:25 2020 CET
# gpg:                using RSA key 149325FD15904E9C4EB89E95E81444E9CE1F695D
# gpg: Good signature from "Rick van Hattem <[email protected]>" [ultimate]
# gpg:                 aka "[jpeg image of size 9662]" [ultimate]

Author: wolph

progressbar/__about__.py

@@ -19,7 +19,7 @@
 long running operations.
 '''.strip().split())
 __email__ = '[email protected]'
-__version__ = '3.46.1'
+__version__ = '3.50.0'
 __license__ = 'BSD'
 __copyright__ = 'Copyright 2015 Rick van Hattem (Wolph)'
 __url__ = 'https://github.com/WoLpH/python-progressbar'