Add skeptic support

[johannhof]

This commit adds Readme testing using skeptic.

I applied some experiences from adding skeptic to other libraries, such as the .travis.yml change that prevents intermittent Travis timeouts.

Unfortunately because skeptic only allows a single interpolation position we need to decide whether we want to display examples like this:

extern crate assert_cli;
fn main() {
  assert_cli::assert_cli_output("echo", &["42"], "42").unwrap();
} 

or like this:

assert_cli::assert_cli_output("echo", &["42"], "42").unwrap();

Meaning that, afaiu, we can't include extern crate without adding fn main.

[killercup]

Thanks! Looks very good!

Can you maybe tweak this a bit to only not use ignore and should_panic? Github doesn't syntax highlight code blocks with multiple language annotations. (I'll leave some inline comments.)

[killercup]

If you find use any other, universally available cli tool (exit?) you can get rid of ignore :)

[johannhof]

Huh, I thought the highlighting on my fork looked fine. https://github.com/johannhof/assert_cli

Am I missing something?

[killercup]

Huh, I thought the highlighting on my fork looked fine.

It does indeed (look at the skeptic branch of course). In the diff-view, it looked weird, but maybe the finally fixed that. Yay!

[killercup]

Released 0.3.0!

• https://github.com/killercup/assert_cli/releases/tag/v0.3.0
• https://crates.io/crates/assert_cli

[johannhof]

Yaaay