Prepare v5.0.0 release

[terrillmoore]

Here are the release tasks:

• [x] Choose a version
• [x] update copyright dates -- need to search (commit 306820682ddc8e19f1ca048e6d0844a9d26c40e6)
• [x] update library.properties (commit 08c96fc59e71033f62ba765e7ea51a051f71ea7e)
• [x] update src/lmic/lmic.h ARDUINO_LMIC_VERSION definition. (commit 08c96fc59e71033f62ba765e7ea51a051f71ea7e)
• [x] update README.md (commit 40ff7dd28ac88f3663a35983c8e9c63745213401)
  • [x] the badges
  • [x] the change history/release notes

• [x] documents

  • [x] update Word doc see #977
  • [x] rename
  • [x] regenerate PDF and redline file
  • [x] change links in README.md and doc/README.md because the version is embedded in the file name.

  or

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