Update rvk requirement from 0.11.0 to 0.12.0

[dependabot-preview[bot]]

Updates the requirements on rvk to permit the latest version.

Changelog

*Sourced from [rvk's changelog](https://github.com/u32i64/rvk/blob/master/CHANGELOG.md).* > ## [0.12.0] - 2019-05-11 > ### Changed > - `APIClient::new` now accepts `token: impl Into` instead of `token: String`. > - Updated to API version **5.95**. > > ## [0.11.0] - 2019-02-21 > ### Changed > - Added `extra` field to `APIError` ([#4](https://github-redirect.dependabot.com/u32i64/rvk/pull/4)). > - `impl From<&str>` instead of `impl From<&'static str>` for `APIError`. > - Some tweaks to docs. > > ### Added > - New methods. See [`9ca852c`](https://github.com/u32i64/rvk/commit/9ca852cbd9154a6a9374fe727bcd06c16dfe7111). > > ## [0.10.0] - 2019-02-17 > > **yanked**, changes reverted. > ### Added > - `objects::message::Message`: add `pub to_id: Option` and `pub state: Option`. > ### Changed > - `objects::message::Message`'s `peer_id` field is now an `Option` (was `Integer`). > > ## [0.9.1] - 2019-02-12 > ### Added > - `#[derive(Debug)]` for `APIClient` > > ## [0.9.0] - 2018-12-07 > ### Changed > - Rust 2018 :tada: > > ## [0.8.0] - 2018-11-24 > ### Changed > - Updated to API version **5.92**. > > ## [0.7.0] - 2018-10-27 > ### Added > - `messages.getRecentCalls` method. > > ### Changed > - Improved performance using `lazy_static!`. > - Updated to API version **5.87**. > > ## [0.6.0] - 2018-09-14 > ### Changed > - Updated to API version **5.85**. See the [VK API Changelog](https://vk.com/dev/versions). > > ## [0.5.0] - 2018-07-19 > ### Added > - Objects! See [`rvk::objects (v0.5)`](https://docs.rs/rvk/0.5/rvk/objects/index.html). > > ## [0.4.0] - 2018-06-26 > ... (truncated)

Commits

- [`a9d1a65`](https://github.com/u32i64/rvk/commit/a9d1a6582600de0a0b9fdf1d1e93aa0b65b6fc84) Update to API v5.95; APIClient::new now accepts `impl Into\` - [`5f6fc1f`](https://github.com/u32i64/rvk/commit/5f6fc1f80d68fac5bc3476494ea8fe2a298cde79) Move mods `methods` and `objects` - [`bc19157`](https://github.com/u32i64/rvk/commit/bc1915718a9f0dd18b1f5782d67630e451617f93) Add GitHub Actions workflow - See full diff in [compare view](https://github.com/u32i64/rvk/compare/v0.11.0...v0.12.0)

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Dependabot will merge this PR once CI passes on it, as requested by @u32i64.

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[awaitlink]

@dependabot merge

[dependabot-preview[bot]]

Looks like rvk is up-to-date now, so this is no longer needed.