git config --edit
opens the config file in sublime text (Awesome)
I found a workaround for this via this link. In a nutshell, you have to:
Put this command inside the above file(Replace the path for executable if necessary):
#!/bin/sh
"C:\Program Files\Sublime Text 2\sublime_text.exe" $1 &
Place that subl file inside the adequate command directory according to your OS and Sublime Text version (If you have doubts, check the above link comments section). In my case, I'm using Sublime Text 3 with Windows 10 64bit so I placed it in:
C:\Program Files (x86)\Git\usr\bin
Now, in order for you to open the desired file, in git bash use (within file folder)
subl filename