4.2

Changelog;

• get_packets_count added to count active packets (dc62a7e) by @pantonvich
• remove_all_packets added to remove active packets (dc62a7e) by @pantonvich
• update now returning the number of packets still to be delivered (dc62a7e) by @pantonvich
• Check if Serial is a pointer in ThroughHardwareSerial (2c7630a) by @fredilarsen
• ThroughHardwareSerial strategy wiki page added

Bugfix:

• can_start bugfix in ThroughHardwareSerial (1c8b71a) by DanRoad reddit user
• Useless flush special case removed in ThroughHardwareSerial (72cbfde)
• Now agnostic header bits configuration (3266cf3) by @fredilarsen
• Wrong length in receiver function bugfix (1b594d2) by @fredilarsen
• Fix path to examples in platformio manifest file @ivankravets