python37Packages.livereload: 2.6.0 -> 2.6.1 (#61905)

* python37Packages.livereload: 2.6.0 -> 2.6.1

Semi-automatic update generated by
https://github.com/ryantm/nixpkgs-update tools. This update was made
based on information from
https://repology.org/metapackage/python3.7-livereload/versions

* python.pkgs.livereload: fix v2.6.1 build

But the newly added test 'test_watch_multiple_dirs'
is failing consistently