Update image URLs

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RFM95 (#25) ...

- Use librfm95 instead of librfm
- Some improvements & fixes for RFM95
- Add "unblocking" timeout + minor improvements
- Let watchdog bark each 2 seconds instead of 8
  should consume only very little more power but allows to perform checks more frequently
- Slow down SPI for the breadboard wiring

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Use libsdc (#21)

librfm (#20) ...

- Initial changes to include static library
- Fix build and Makefile
- Include and implement now device and F_CPU independent library

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Refactor imeout handling (#13) ...

- move related code to radio
- cancel timeout when "PayloadReady" arrives
- reduce timeout from 1 second to 100 milliseconds
- no delay before transmitting feedback to transmitter
- update README.md

Improve power management, save more power

Cosmetic changes to README.md and display

Cosmetic changes to README.md and display

Fix typo

Transmit output power and display it along with the temperature

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Update README.md

Frequency deviation/receiver bandwidth (#8) ...

- 10/20 kHz is enough to remove temperature susceptibility
- fix display of negative temperature values

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Update README.md

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