Update GIT.config to use Visual Studio for mergetool

git.config

[diff]
tool = vsdiffmerge

[difftool]
prompt = false

[difftool "vsdiffmerge"]
cmd = "'C:/Program Files (x86)/Microsoft Visual Studio 14.0/Common7/IDE/vsdiffmerge.exe' $LOCAL $REMOTE //t"
keepbackup = false
trustexitcode = true

[merge]
tool = vsdiffmerge

[mergetool]
prompt = false

[mergetool "vsdiffmerge"]
cmd = "'C:/Program Files (x86)/Microsoft Visual Studio 14.0/Common7/IDE/vsdiffmerge.exe' $REMOTE $LOCAL $BASE $MERGED //m"
keepbackup = false
trustexitcode = true