Updated changelog for 2.0.0 release.
Updated changelog for 2.0.0 release.

svenax/svn2git,Muktesh01/svn2git,fredpalmer/svn2git,aucampia/svn2git,ritusingh161291/svn2git_ritu_repo,nirvdrum/svn2git,opoplawski/svn2git