AEA-444 Small update in the thermometer demo.

[Totoual]

Proposed changes

Added a Note in the guide to inform that we have to change the config.

Fixes

Types of changes

What types of changes does your code introduce to agents-aea?
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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

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• I have read the CONTRIBUTING doc
• I am making a pull request against the develop branch (left side). Also you should start your branch off our develop.
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have checked that code coverage does not decrease.
• I have checked that the documentation about the aea cli tool works
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in downstream modules

[codecov-io]

Codecov Report

Merging #937 into develop will increase coverage by 4.84%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #937      +/-   ##
===========================================
+ Coverage    91.08%   95.93%   +4.84%     
===========================================
  Files          120      120              
  Lines         8954     8948       -6     
===========================================
+ Hits          8156     8584     +428     
+ Misses         798      364     -434     

Flag	Coverage Δ
#unittests	95.93% <ø> (+4.84%)	⬆️

Impacted Files	Coverage Δ
aea/cli_gui/__init__.py	87.54% <0.00%> (+0.24%)	⬆️
aea/configurations/base.py	100.00% <0.00%> (+0.31%)	⬆️
aea/protocols/generator.py	96.14% <0.00%> (+52.04%)	⬆️

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[DavidMinarsch]

NOTE: If you are not using a Raspberry Pi make sure you set the has_sensorattribute toFalse`

[DavidMinarsch]

LGTM