Rollup merge of #38655 - alexcrichton:travis-and-then, r=brson
Rollup merge of #38655 - alexcrichton:travis-and-then, r=brson

travis: Use `&&` intead of `;`

Show errors sooner and try not to hide them behind lots of other walls of text.

aidancully/rust,GBGamer/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,GBGamer/rust,graydon/rust,graydon/rust,GBGamer/rust,graydon/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,aidancully/rust,GBGamer/rust,aidancully/rust,GBGamer/rust,GBGamer/rust