2.8.4

• Merge remote-tracking branch 'origin/master' into stable
• bump version 2.8.3 > 2.8.4, module.json and version.txt
• RFM69: close the previous radio on watchdog restart
• Update parameters in Econext readme
• Merge pull request #242 from openenergymonitor/master
• Merge pull request #241 from openenergymonitor/master

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