Prepare V4.1.0 release

[terrillmoore]

Here are the release tasks:

• [x] Choose a version
• [x] update library.properties
• [x] update src/lmic/lmic.h ARDUINO_LMIC_VERSION definition.
• [x] update README.md
  • [x] the badges
  • [x] the change history/release notes

• [x] documents

  • [x] update Word doc,
  • [x] change links in README.md

  or

  • [ ] leave Word doc for next time.
• [x] create a pull request
• [x] merge
• [x] tag/release