fix attribute error related to pygments #225
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Hi,
this fixes the issue discussed in #224 related to
lookatme/lookatme/render/pygments.py
Line 72 in c05abe1
The
background
attribute in theurwid.AttrSpec
class is now a property. To modify it we need to create a copy of the object withurwid.AttrSpec.copy_modified
.