Enable resolver ver2

[akru]

As maybe-async-cfg crate docs suggested

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PR description

maybe_async_cfg crate suggested to add resolver v2 directive. For me it fixes compilation issues.

RECOMMENDATION: Enable resolver ver2 in your crate, which is introduced in Rust 1.51. If not, two crates in dependency with conflict version (one async and another blocking) can fail compilation.

[eldruin]

Thank you!
Could you add a short entry to the changelog explaining this?

[akru]

@eldruin Sure, added note into CHANGELOG.

[akru]

@eldruin may be problem isn't in resolver btw; this problem I tried to solve: #219, anyway, ver2 is recommended, why not use it

[eldruin]

Looks good to me, thanks!