Release 2.0.1

[arcao]

Summary

• README: new Usage notes section
  • call udpClient.begin(localPort) before logging — required by Ethernet, WiFi Shield and WiFiNINA (Using syslog.logf crashed the Arduino #19, Pass IP address instead of server name #26)
  • strings passed to the constructor / server / deviceHostname / appName are not copied and must stay valid (closes Documentation or warning that Syslog constructor doesn't make deep copies  #17)
• README: WiFiNINA boards added to Compatible Hardware
• Version bumped to 2.0.1 in library.properties and library.json

Changes since 2.0.0

• Fix logf / logf_P crash or garbage output for longer messages (logf_P fails #18, Fix va_list reuse in vlogf/vlogf_P and open UDP socket in examples #29)
• Examples open the UDP socket before logging (Using syslog.logf crashed the Arduino #19, Pass IP address instead of server name #26, Fix va_list reuse in vlogf/vlogf_P and open UDP socket in examples #29)
• New examples: WiFiNINA (Example for SimpleLogging for the WiFiNINA library #27), ESP32 (Add SimpleLoggingESP32 example #31)
• CI moved from Travis to GitHub Actions (Replace Travis CI with GitHub Actions build check #30)

After merge: tag v2.0.1 and create a GitHub release, so Arduino Library Manager and PlatformIO pick it up.

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