Failuer to count couples when both of files have been renamed

[sirogane1013]

Hercules double counts the number of couples when both of coupled files is renamed.

When the commit log is given as follows:
Commit1:
A FileA
A FileB
Commit2:
M FileA
M FileB
Commit3:
R FileA -> FileA'
R FileB -> FileB'
Commit4:
M FileA'
M FileB'

the true number of couple of FileA' and FileB' is 4.
However, Hercules counts the co-occurrence in Commit1 and Commit2, so it outputs 6.

[vmarkovtsev]

Thanks! I'll fix this. The project has gone a bit unmaintained recently, but I am planning to resurrect the development 👍