README: Remove outdated version number
README: Remove outdated version number

We have the version in configure.ac and NEWS where it gets updated for
releases. This occurrence gets forgotten to often on the other hand. Its
not needed here so we remove it.

rvandegrift/elementary,FlorentRevest/Elementary,rvandegrift/elementary,tasn/elementary,tasn/elementary,tasn/elementary,FlorentRevest/Elementary,FlorentRevest/Elementary,FlorentRevest/Elementary,rvandegrift/elementary,tasn/elementary,rvandegrift/elementary,tasn/elementary