Now that it is possible to set the vscode as git's cli editor (https://github.com/Microsoft/vscode/issues/744), it would be great to highlight `COMMIT_EDITMSG` [like Atom does](https://f.cloud.github.com/assets/671378/2402807/fbebfeea-aa26-11e3-94c0-7caffd1774e8.gif).