GitClient log arguments result in spurious character

The following task
```xml
 <Target Name="gitlog">
   <GitClient Command="log" Arguments='--pretty=format:"%cd %d %s" --date=format:"%d/%m/%y"'  />
  </Target>
```
Produces this result. Notice %cd has changed to Í

``
C:\Program Files\Git\cmd\git.exe log --pretty=format:"Í %d %s" --date=format:"%d/%m/%y"
``