Update libp2p requirement from 0.37 to 0.38 in /communication

[dependabot]

Updates the requirements on libp2p to permit the latest version.

Release notes

Sourced from libp2p's releases.

v0.38.0

See individual changelogs for details.

Changelog

Sourced from libp2p's changelog.

Version 0.38.0 [2021-05-17]

• Update individual crates.
  • libp2p-core
  • libp2p-gossipsub
  • libp2p-noise
  • libp2p-pnet
  • libp2p-wasm-ext

Version 0.37.1 [2021-04-14]

• Update individual crates.
  • libp2p-swarm-derive

Version 0.37.0 [2021-04-13]

• Update individual crates.

  • libp2p-core
  • libp2p-dns
  • libp2p-floodsub
  • libp2p-gossipsub
  • libp2p-kad
  • libp2p-mdns
  • libp2p-ping
  • libp2p-relay
  • libp2p-request-response
  • libp2p-swarm
  • libp2p-wasm-ext
  • libp2p-yamux

• Drop support for wasm32-unknown-unknown in favor of wasm32-unknown-emscripten and wasm32-wasi PR 2038.

Version 0.36.0 [2021-03-17]

• Consolidate top-level utility functions for constructing development transports. There is now just development_transport() (available with default features) and tokio_development_transport() (available when the corresponding tokio features are enabled). Furthermore, these are now async fns. The minor variations that also included pnet support have been removed. PR 1927

• Update libp2p crates.

• Do not leak default features from libp2p crates. PR 1986.

• Add libp2p-relay to libp2p facade crate.

... (truncated)

Commits

• 0b7ee3f *: Prepare v0.38.0 (#2072)
• c5bcada protocols/gossipsub: Rework connection keep-alive (#2043)
• 9c5dd84 build(deps): Update snow requirement from 0.7.1 to 0.8.0 (#2068)
• 1fdac07 build(deps): Bump actions-rs/toolchain from 1 to 1.0.7 (#2069)
• 10fcc1c build(deps): Bump actions-rs/cargo from 1 to 1.0.3 (#2070)
• 82c8b1a build(deps): Bump actions/checkout from 2 to 2.3.4 (#2071)
• 43a8ad8 protocols/relay/examples: Add client server instructions (#2060)
• 8988ac2 protocols/mdns: Fix discovered event emission. (#2065)
• 5c541a1 build(deps): update salsa20 requirement from 0.7 to 0.8 (#2062)
• d931f36 transport/wasm-ext: Support dialing Multiaddr with /p2p protocol (#2058)
• Additional commits viewable in compare view

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[elenaf9]

Included in #210.

[dependabot]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.