Update kube requirement from 0.20 to 0.22

[dependabot-preview]

Updates the requirements on kube to permit the latest version.

Changelog

Sourced from kube's changelog.

0.22.1 / 2019-11-30

• Improve Reflector reset algorithm (clear history less)

0.22.0 / 2019-11-29

• Default watch timeouts changed to 300s everywhere
• This increases efficiency of Informers and Reflectors by keeping the connection open longer.
• However, if your Reflector relies on frequent polling you can set timeout or hide the poll() in a different context so it doesn't block your main work
• Internal RwLock changed to a futures::Mutex for soundness / proper non-blocking - #94
• blocking Reflector::read() renamed to async Reflector::state()
• Expose metadata.creation_timestamp and .deletion_timestamp (behind openapi flag) - #93

0.21.0 / 2019-11-29

• All watch calls returns a stream of WatchEvent - #92
• Informer::poll now returns a stream - #92

0.20.1 / 2019-11-21

• ObjectList now implements Iterator - #91
• openapi feature no longer accidentally hardcoded to v1.15 feature - #90

0.19.0 / 2019-11-15

• kube::Error is now a proper error enum and not a Fail impl (thiserror)
• soft-tokio dependency removed for futures-timer
• gzip re-introduced

0.18.1 / 2019-11-11

• Fix unpinned gzip dependency breakage - #87

0.18.0 / 2019-11-07

• api converted to use async/await with 1.39.0 (primitively)
• hyper upgraded to 0.10-alpha
• synchronous sleep replaced with tokio timer
• Log trait removed in favour of internal marker trait

0.17.0 / 2019-10-22

• Add support for oidc providerss with auth-provider w/o access-token - #70
• Bump most dependencies to more recent versions
• Expose custom client creation
• Added support for v1beta1Ingress
• Expose incluster_config::load_default_ns - #74

0.16.1 / 2019-08-09

... (truncated)

Commits

• a14c140 0.22.1
• bd4dd81 forgot to check resync flag
• 1e47d97 better informer reset algorithm
• f71e724 0.22.0
• dbed741 Reflector interface changes + timeout default changes
• 58e5613 expose timestamps in metadata when using openapi feature - for #93
• f5d39b2 Merge pull request #95 from kitfre/async-locks
• 25d164e convert to async locks in reflector
• df8da10 convert to async locks in informer
• c590fdc 0.21.0
• Additional commits viewable in compare view

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