Applied second review notes from Robert-André Mauchin

Ref.:

    https://bugzilla.redhat.com/show_bug.cgi?id=1595420#c4

ydiff.spec.in

 URL:        https://github.com/ymattw/ydiff
 License:    BSD
 Source0:    __APP_URLBASE__/archive/%{version}/%{name}-%{version}.tar.gz
-BuildRequires: python2-devel
 BuildRequires: python3-devel
 BuildArch: noarch
 
 workspace or from stdin, with side by side (similar to diff -y) and auto
 pager support.
 
-%package -n python2-%{name}
-Summary: %{summary}
-%description -n python2-%{name}
-Python library that implements API used by ydiff tool.
-
 %package -n     python3-%{name}
 Summary:        %{summary}
 %{?python_provide:%python_provide python3-%{name}}
 /usr/bin/sed -i '/#!\/usr\/bin\/env python/d' ydiff.py
 
 %build
-%py2_build
 %py3_build
 
 %install
-%py2_install
 %py3_install
 
 %files
 %license LICENSE
 %{_bindir}/ydiff
 
-%files -n python2-%{name}
-%{python2_sitelib}/%{name}.py
-%{python2_sitelib}/%{name}.pyc
-%{python2_sitelib}/%{name}.pyo
-%{python2_sitelib}/%{name}-*.egg-info
-
 %files -n python3-%{name}
 %{python3_sitelib}/__pycache__/*
 %{python3_sitelib}/%{name}.py