Travis is failing during setup

[elliotekj]

Travis seems to failing whilst setting up diesel_cli:

I'm seeing this in #775 but @Turbo87 is seeing it too in #772.

At the time of writing this, #772 is 13 hours old. The last passing test looks to be this commit from #771 20 hours ago.

cc'ing @sgrif because Diesel :)

[carols10cents]

Ah, we added cache: cargo: true. We should probably add --force to always get the latest version of diesel, as the error message suggests. Can you send me a PR? Otherwise I can get to this in a few hours :)

[elliotekj]

Good call @carols10cents — adding --force fixed the diesel_cli issue. Unfortunately Travis failed with a similar error when installing rustfmt.

If --force is going to be needed on both of the cargo installs then reverting 209dab0#diff-354f30a63fb0907d4ad57269548329e3 seems like the best course of action because we won't be getting any benefit from it anyway (unless I'm missing something?).

[carols10cents]

I think it'll cache all of our other dependencies, which should help overall time of the travis builds. I think adding --force to rustfmt too is fine!

[elliotekj]

Right'o, I'll make the change :)