Rename local variable

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Boost performance of showing reflog using git.exe

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Show reflog date column

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Fix warning

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>