Auto merge of #5693 - rust-lang:dependabot/cargo/lazycell-1.0, r=alexcrichton

Update lazycell requirement to 1.0

Updates the requirements on [lazycell](https://github.com/indiv0/lazycell) to permit the latest version.
<details>
<summary>Release notes</summary>

*Sourced from [lazycell's releases](https://github.com/indiv0/lazycell/releases).*

> ## v1.0.0
> <a name="v1.0.0"></a>
> ## v1.0.0 (2018-06-06)
>
>
> #### Features
>
> *   Add #![no_std] ([e59f6b55](indiv0/lazycell@e59f6b5))
</details>
<details>
<summary>Changelog</summary>

*Sourced from [lazycell's changelog](https://github.com/indiv0/lazycell/blob/master/CHANGELOG.md).*

> ## v1.0.0 (2018-06-06)
>
>
> #### Features
>
> *   Add #![no_std] ([e59f6b55](indiv0/lazycell@e59f6b5))
>
>
>
> <a name="0.6.0"></a>
> ## 0.6.0 (2017-11-25)
>
>
> #### Bug Fixes
>
> *   fix soundness hole in borrow_with ([d1f46bef](indiv0/lazycell@d1f46be))
>
> #### Features
>
> *   add Default derives ([71bc5088](indiv0/lazycell@71bc508))
> *   add LazyCell::try_borrow_with ([bffa4028](indiv0/lazycell@bffa402))
> *   add LazyCell::borrow_mut method ([fd419dea](indiv0/lazycell@fd419de))
>
> #### Breaking Changes
>
> *   add `T: Send` for `AtomicLazyCell` `Sync` impl ([668bb2fa](indiv0/lazycell@668bb2f), closes [#67](https://github-redirect.dependabot.com/indiv0/lazycell/issues/67))
>
> #### Improvements
>
> *   add `T: Send` for `AtomicLazyCell` `Sync` impl ([668bb2fa](indiv0/lazycell@668bb2f), closes [#67](https://github-redirect.dependabot.com/indiv0/lazycell/issues/67))
>
>
>
> <a name="v0.5.1"></a>
> ## v0.5.1 (2017-03-24)
>
>
> #### Documentation
>
> *   fix missing backticks ([44bafaaf](indiv0/lazycell@44bafaa))
>
> #### Improvements
>
> *   derive `Debug` impls ([9da0a5a2](indiv0/lazycell@9da0a5a))
>
> #### Features
>
> *   Add get method for Copy types ([dc8f8209](indiv0/lazycell@dc8f820))
>
>
></table> ... (truncated)
</details>
<details>
<summary>Commits</summary>

- See full diff in [compare view](https://github.com/indiv0/lazycell/commits/v1.0.0)
</details>
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Author: bors

Cargo.toml

@@ -35,7 +35,7 @@ home = "0.3"
 ignore = "0.4"
 lazy_static = "1.0.0"
 jobserver = "0.1.9"
-lazycell = "0.6"
+lazycell = "1.0"
 libc = "0.2"
 libgit2-sys = "0.7.1"
 log = "0.4"