Merge #742

742: Bump structopt from 0.2.18 to 0.3.0 r=syrusakbary a=dependabot-preview[bot]

Bumps [structopt](https://github.com/TeXitoi/structopt) from 0.2.18 to 0.3.0.
<details>
<summary>Changelog</summary>

*Sourced from [structopt's changelog](https://github.com/TeXitoi/structopt/blob/master/CHANGELOG.md).*

> # v0.3.0 (2019-08-30)
> 
> ## Breaking changes
> 
> ### Bump minimum rustc version to 1.36 by [@&#8203;TeXitoi](https://github.com/TeXitoi)
> Now `rustc` 1.36 is the minimum compiler version supported by `structopt`,
> it likely won't work with older compilers.
> 
> ### Remove "nightly" feature
> Once upon a time this feature had been used to enable some of improvements
> in `proc-macro2` crate that were available only on nightly. Nowadays this feature doesn't
> mean anything so it's now removed.
> 
> ### Support optional vectors of arguments for distinguishing between `-o 1 2`, `-o` and no option provided at all by [@&#8203;sphynx](https://github.com/sphynx) ([#180](https://github-redirect.dependabot.com/TeXitoi/structopt/issues/188)).
> 
> ```rust
> #[derive(StructOpt)]
> struct Opt {
>   #[structopt(long)]
>   fruit: Option<Vec<String>>,
> }
> 
> fn main() {
>   assert_eq!(Opt::from_args(&["test"]), None);
>   assert_eq!(Opt::from_args(&["test", "--fruit"]), Some(vec![]));
>   assert_eq!(Opt::from_args(&["test", "--fruit=apple orange"]), Some(vec!["apple", "orange"]));
> }
> ```
> 
> If you need to fall back to the old behavior you can use a type alias:
> ```rust
> type Something = Vec<String>;
> 
> #[derive(StructOpt)]
> struct Opt {
>   #[structopt(long)]
>   fruit: Option<Vec<String>>,
> }
> ```
> 
> ### Change default case from 'Verbatim' into 'Kebab' by [@&#8203;0ndorio](https://github.com/0ndorio) ([#202](https://github-redirect.dependabot.com/TeXitoi/structopt/issues/202)).
> `structopt` 0.3 uses field renaming to deduce a name for long options and subcommands.
> 
> ```rust
> #[derive(StructOpt)]
> struct Opt {
>   #[structopt(long)]
>   http_addr: String, // will be renamed to `--http-addr`
> 
>   #[structopt(subcommand)]
></tr></table> ... (truncated)
</details>
<details>
<summary>Commits</summary>

- [`673dbcc`](TeXitoi/structopt@673dbcc) Bump minimum rustc version to 1.36
- [`b57dde1`](TeXitoi/structopt@b57dde1) Update dependencies ([#227](https://github-redirect.dependabot.com/TeXitoi/structopt/issues/227))
- [`8830771`](TeXitoi/structopt@8830771) Update documentation and changelog ([#236](https://github-redirect.dependabot.com/TeXitoi/structopt/issues/236))
- [`6bd1a69`](TeXitoi/structopt@6bd1a69) Update keyvalue example ([#234](https://github-redirect.dependabot.com/TeXitoi/structopt/issues/234))
- [`73db781`](TeXitoi/structopt@73db781) Update raw_bool_literal.rs ([#231](https://github-redirect.dependabot.com/TeXitoi/structopt/issues/231))
- [`2363815`](TeXitoi/structopt@2363815) Update changelog
- [`dc5ec7a`](TeXitoi/structopt@dc5ec7a) Emit error about `raw` removal
- [`a91109c`](TeXitoi/structopt@a91109c) Change behavior of `about/author/version` and ad `no_version`
- [`5dfa606`](TeXitoi/structopt@5dfa606) Now error messages highlight the error location ([#225](https://github-redirect.dependabot.com/TeXitoi/structopt/issues/225))
- [`94946c3`](TeXitoi/structopt@94946c3) Add documentation for `env` ([#221](https://github-redirect.dependabot.com/TeXitoi/structopt/issues/221))
- Additional commits viewable in [compare view](TeXitoi/structopt@v0.2.18...v0.3.0)
</details>
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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: Syrus Akbary <me@syrusakbary.com>

Cargo.toml

@@ -21,7 +21,7 @@ include = [
 [dependencies]
 byteorder = "1.3.2"
 errno = "0.2.4"
-structopt = "0.2.18"
+structopt = "0.3.0"
 wabt = "0.9.1"
 wasmer-clif-backend = { path = "lib/clif-backend" }
 wasmer-singlepass-backend = { path = "lib/singlepass-backend", optional = true }