Bump r2d2

[jtgeibel]

cargo update -p r2d2

Refs: #1805

[rust-highfive]

r? @smarnach

(rust_highfive has picked a reviewer for you, use r? to override)

[jtgeibel]

We should do the deploy, merge, deploy dance on this one, just to be safe.

[smarnach]

This pulls in two new versions of parking_lot (in addition to the two versions we've already been using), so there is definitely some potential for things going wrong there.

I can't deploy, so I'm randomly selecting
r? @carols10cents
as new assignee.

[jtgeibel]

This pulls in two new versions of parking_lot (in addition to the two versions we've already been using)

Yeah, this is unfortunate. (Although the duplication isn't quite that bad, as one pair is parking_lot and the other parking_lot_core.) Long term, I'm hoping to get this under control, but its difficult because we effectively can't run cargo update at this time.

In terms of build time, it especially bad that we pull in 3 or 4 versions of syn and quote. Fortunately, these are both 1.0 now so as we update other things those should consolidate.

[carols10cents]

I'm good with this, but I don't want to do this at the same time that we're switching to cloudfront, so I'll do the deploy-merge-deploy dance on Wednesday.

[carols10cents]

Dance time!!!

@bors r+

[bors]

📌 Commit 4876857 has been approved by carols10cents

[bors]

⌛ Testing commit 4876857 with merge ae7834e...

[bors]

☀️ Test successful - checks-travis
Approved by: carols10cents
Pushing ae7834e to master...