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* reduce Routing Table churn

* peer diversity for the Routing Table.

* This is the fix for the bug wherein we don't fire PeerRemoved notifications when we replace "less useful" peers in a bucket.

`AddedAt` field for a peer in the Routing Table.

* reduce allocs while adding peer

* nPeerForCpl and collapse empty buckets

Merge pull request #74 from libp2p/dependabot/go_modules/github.com/libp2p/go-libp2p-peerstore-0.2.3

Bump github.com/libp2p/go-libp2p-peerstore from 0.2.2 to 0.2.3

fix: use time.Duration for time, not floats

Bumps [github.com/libp2p/go-libp2p-peerstore](https://github.com/libp2p/go-libp2p-peerstore) from 0.2.2 to 0.2.3.
- [Release notes](https://github.com/libp2p/go-libp2p-peerstore/releases)
- [Commits](https://github.com/libp2p/go-libp2p-peerstore/compare/v0.2.2...v0.2.3)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Add LastUsefulAt and LastSuccessfulQueryAt for each peer

Bump github.com/ipfs/go-log from 1.0.2 to 1.0.3

Bump github.com/libp2p/go-libp2p-core from 0.5.0 to 0.5.1

fix: correctly track CPLs of never refreshed buckets

To determine how many buckets we should refresh, we:

1. Look at the max bucket.
2. Look at the peer with the greatest common prefix in the max bucket.
3. Return the "last refresh" times for all buckets between 0 and `min(maxPeer, 15)`

BREAKING: this returns a slice of times instead of CplRefresh objects because we
want to refresh _all_ buckets between 0 and the max CPL.

Bumps [github.com/libp2p/go-libp2p-core](https://github.com/libp2p/go-libp2p-core) from 0.5.0 to 0.5.1.
- [Release notes](https://github.com/libp2p/go-libp2p-core/releases)
- [Commits](https://github.com/libp2p/go-libp2p-core/compare/v0.5.0...v0.5.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Get Peer Infos

fix: use accurate bucket logic

This reverts an optimization where we fudged the closer peers when returning
responses to users when we were within a power of two to the target.

* cache the XOR DHT ID for a peerId

Bumps [github.com/ipfs/go-log](https://github.com/ipfs/go-log) from 1.0.2 to 1.0.3.
- [Release notes](https://github.com/ipfs/go-log/releases)
- [Commits](https://github.com/ipfs/go-log/compare/v1.0.2...v1.0.3)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* Routing Table refactor for new management logic

Merge pull request #65 from libp2p/dependabot/go_modules/github.com/libp2p/go-libp2p-peerstore-0.2.2

Bump github.com/libp2p/go-libp2p-peerstore from 0.2.1 to 0.2.2

Bumps [github.com/libp2p/go-libp2p-peerstore](https://github.com/libp2p/go-libp2p-peerstore) from 0.2.1 to 0.2.2.
- [Release notes](https://github.com/libp2p/go-libp2p-peerstore/releases)
- [Commits](https://github.com/libp2p/go-libp2p-peerstore/compare/v0.2.1...v0.2.2)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Merge pull request #61 from libp2p/dependabot/go_modules/github.com/libp2p/go-libp2p-peerstore-0.2.1

Bump github.com/libp2p/go-libp2p-peerstore from 0.2.0 to 0.2.1

Bumps [github.com/libp2p/go-libp2p-peerstore](https://github.com/libp2p/go-libp2p-peerstore) from 0.2.0 to 0.2.1.
- [Release notes](https://github.com/libp2p/go-libp2p-peerstore/releases)
- [Commits](https://github.com/libp2p/go-libp2p-peerstore/compare/v0.2.0...v0.2.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Replace dead peers & increase replacement cache size

Bumps [github.com/libp2p/go-libp2p-core](https://github.com/libp2p/go-libp2p-core) from 0.3.0 to 0.5.0.
- [Release notes](https://github.com/libp2p/go-libp2p-core/releases)
- [Commits](https://github.com/libp2p/go-libp2p-core/compare/v0.3.0...v0.5.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Merge pull request #56 from libp2p/dependabot/go_modules/github.com/libp2p/go-libp2p-peerstore-0.2.0

Bump github.com/libp2p/go-libp2p-peerstore from 0.1.4 to 0.2.0