Remove flake8 build requirement

opencv.spec

@@ -60,7 +60,7 @@
 
 Name:           opencv
 Version:        4.2.0
-Release:        8%{?dist}
+Release:        9%{?dist}
 Summary:        Collection of algorithms for computer vision
 # This is normal three clause BSD.
 License:        BSD
@@ -119,7 +119,6 @@ BuildRequires:  tbb-devel
 BuildRequires:  zlib-devel
 BuildRequires:  pkgconfig
 BuildRequires:  python3-devel
-BuildRequires:  python3-flake8
 BuildRequires:  python3-numpy
 BuildRequires:  pylint
 BuildRequires:  swig >= 1.3.24
@@ -471,6 +470,9 @@ popd
 %{_libdir}/libopencv_xphoto.so.%{abiver}*
 
 %changelog
+* Thu May 28 2020 Charalampos Stratakis <cstratak@redhat.com> - 4.2.0-9
+- Remove flake8 build requirement
+
 * Tue May 26 2020 Miro Hrončok <mhroncok@redhat.com> - 4.2.0-8
 - Rebuilt for Python 3.9