Multiple/stale progress messages displayed

[wbthomason]

I've noticed a bug lately wherein the default statusline component can start to display several progress items at once, resulting in stale progress items being displayed and never removed. I think this has to do with the changes in #45, but I'm not sure. Easiest way to trigger it so far is to request a documentation hover multiple times rapidly while a server is indexing.

[augustocdias]

I don't know if this is the same issue, but lsp status is causing the progress and location in my status line to stop working properly... See the image my progress with 439%.

[towry]