Clear example fails to build

[creikey]

Here is the stack trace:

    Updating git repository `https://github.com/floooh/sokol-rust.git`
    Updating git submodule `[email protected]:cimgui/cimgui.git`
error: failed to get `sokol` as a dependency of package `spacerust v0.1.0 (C:\Users\Cameron\Documents\spacerust)`

Caused by:
  failed to load source for dependency `sokol`

Caused by:
  Unable to update https://github.com/floooh/sokol-rust.git

Caused by:
  failed to update submodule `src/sokol/c/cimgui`

Caused by:
  failed to fetch submodule `src/sokol/c/cimgui` from [email protected]:cimgui/cimgui.git

Caused by:
  failed to authenticate when downloading repository

  * attempted ssh-agent authentication, but no usernames succeeded: `git`

  if the git CLI succeeds then `net.git-fetch-with-cli` may help here
  https://doc.rust-lang.org/cargo/reference/config.html#netgit-fetch-with-cli

Caused by:
  error authenticating: unable to connect to agent pipe; class=Ssh (23)

I think this is caused by the git submodule in the repo being an ssh url not an https one

[floooh]

Oops, thanks for catching that, I changed the submodule url in .gitmodules to https, not sure what needs to be done on an existing clone (probably git submodule sync, ... but it's probably safest to delete and clone again.

Eventually the plan is to move all the ImGui stuff out of the core sokol-rust repository (see: #3)