message: Lowercase GH org name in .gitmodules
  The `Microsoft` org has been renamed to `microsoft`. While casing isn't an issue with GitHub, just correcting it in case some implementations are case-sensitive.
diff: [submodule "dep/gsl"]
  path = dep/gsl
  - url = https://github.com/Microsoft/gsl
  + url = https://github.com/microsoft/gsl
  [submodule "dep/wil"]
  path = dep/wil
  - url = https://github.com/Microsoft/wil
  + url = https://github.com/microsoft/wil
  