Bump proc-macro2 from 0.4.30 to 1.0.5

[dependabot-preview[bot]]

Bumps proc-macro2 from 0.4.30 to 1.0.5.

Release notes

*Sourced from [proc-macro2's releases](https://github.com/alexcrichton/proc-macro2/releases).* > ## 1.0.5 > - Improve performance of `impl Extend for TokenStream` ([#198](https://github-redirect.dependabot.com/alexcrichton/proc-macro2/issues/198)) > > ## 1.0.4 > - Add `Literal::subspan` method to match libproc_macro ([#195](https://github-redirect.dependabot.com/alexcrichton/proc-macro2/issues/195)) > > ## 1.0.3 > - Treat dev builds of rustc the same as a nightly, with unstable features available > > ## 1.0.2 > - Add `impl From for TokenStream` to match libproc_macro > > ## 1.0.1 > - Documentation improvements > - Fail with a better error message when being built on a compiler that is too old > > ## 1.0.0 > - Minimum supported rustc version is raised from 1.15 to 1.31 > - Deprecated `TokenStream::empty` constructor has been removed in favor of `TokenStream::new`

Commits

- [`a4e9050`](https://github.com/alexcrichton/proc-macro2/commit/a4e90503a3b336c46f369dca65dfb571069c657d) Release 1.0.5 - [`29c19f4`](https://github.com/alexcrichton/proc-macro2/commit/29c19f47920de1eebe81cb2939ebdb669410393f) Merge pull request [#199](https://github-redirect.dependabot.com/alexcrichton/proc-macro2/issues/199) from dtolnay/extend - [`b07092c`](https://github.com/alexcrichton/proc-macro2/commit/b07092c6088c6d3751ae67c63a69cbcaff20c40b) Defer calls to proc_macro::TokenStream::extend - [`74f2200`](https://github.com/alexcrichton/proc-macro2/commit/74f2200094ee26fb882f1d4b3d221ea8ef837c8a) Remove slow_extend codepath - [`7f21087`](https://github.com/alexcrichton/proc-macro2/commit/7f2108731a6603f3935b6fd9c2c33fa355dd75ee) Simplify FromIterator\ for TokenStream - [`12bac84`](https://github.com/alexcrichton/proc-macro2/commit/12bac84dd8d090d2987a57b747c7ae7bbeb8a3d0) Add basic benchmark of libproc_macro - [`a0fa7dd`](https://github.com/alexcrichton/proc-macro2/commit/a0fa7ddd10c8b52a1453e6d4498b919eae4aec40) Merge pull request [#196](https://github-redirect.dependabot.com/alexcrichton/proc-macro2/issues/196) from mathstuf/target-as-symlink - [`c67a173`](https://github.com/alexcrichton/proc-macro2/commit/c67a173ac8d27831fe16c134b6980ea1fd8346d4) gitignore: ignore target as a symlink - [`bdac373`](https://github.com/alexcrichton/proc-macro2/commit/bdac3732544a3cfb73afe4548f550c369e906856) Release 1.0.4 - [`20ca121`](https://github.com/alexcrichton/proc-macro2/commit/20ca121e413c6ff0d97e90ed73a1527a32693551) Format with rustfmt 2019-09-08 - Additional commits viewable in [compare view](https://github.com/alexcrichton/proc-macro2/compare/0.4.30...1.0.5)

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[marysaka]

@dependabot rebase

[dependabot-preview[bot]]

Superseded by #517.