v0.3.1

What's Changed

• Remove unneeded mut from send_ping(..) by @KolbyML in #192
• Fix unexpected ConnectionDirection update by @ackintosh in #188
• Respond to a PING even if the source doesn't match the ENR by @ackintosh in #184
• Speed up ENR update by @ackintosh in #196
• Update libp2p-core by @ackintosh in #197
• Version bump to v0.3.1 by @AgeManning in #203

Full Changelog: v0.3.0...v0.3.1