Raise minimum hg version
Following the support of the topics extension, raise the hg requirement to 4.8 to be consistent throughout the feature set. At this date, the latest version of topic (10.5.2) requires Mercurial 4.8.
Following the support of the topics extension, raise the hg requirement to 4.8 to be consistent throughout the feature set. At this date, the latest version of topic (10.5.2) requires Mercurial 4.8.