Breaking change to primary header filename not mentioned in release notes

[per1234]

The primary header filename was changed from USBHostMbed5.h to Arduino_USBHostMbed5.h in the 0.0.3 release:

c3182e9

This is a breaking change. Frequent breaking changes should be expected by the user of any project that is still in the unstable development phase, as indicated by the use of the the 0 major version series, however, it is still best practices to communicate about breaking changes even during that development phase.

No communication of the breaking change was made in the 0.0.3 release notes:

https://github.com/arduino-libraries/Arduino_USBHostMbed5/releases/tag/0.0.3

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Originally reported at https://forum.arduino.cc/t/usb-host-keyboard-example-from-arduino-hidhost-library-not-found/1102876/10

[aentinger]

Done, see here: https://github.com/arduino-libraries/Arduino_USBHostMbed5/releases/tag/0.0.3