updated for version 7.4.167
Problem:    Fixes are not tested.
Solution:   Add a test for not autoloading on assignment. (Yukihiro Nakadaira)
Added tag v7-4-167 for changeset 22387c8eec43
updated for version 7.4.168
Problem:    Can't compile with Ruby 2.1.0.
Solution:   Add support for new GC. (Kohei Suzuki)
Added tag v7-4-168 for changeset e61a2b709f69
updated for version 7.4.169
Problem:    ":sleep" puts cursor in the wrong column. (Liang Li)
Solution:   Add the window offset. (Christian Brabandt)
Added tag v7-4-169 for changeset 4e3a9dd25d42