Fixed warnings from publication dry-run

[mvanbeusekom]

✨ What kind of change does this PR introduce? (Bug fix, feature, docs update...)

Bug fix

⤵️ What is the current behavior?

Running flutter packages pub publish --dry-run results in a list with warning that should be solved.

🆕 What is the new behavior (if this is a feature change)?

Solved the warnings shown after running flutter packages pub publish --dry-run

💥 Does this PR introduce a breaking change?

No

🐛 Recommendations for testing

N/A

📝 Links to relevant issues/docs

🤔 Checklist before submitting

• All projects build
• Rebased onto current develop

[codecov-io]

Codecov Report

Merging #15 into develop will decrease coverage by 0.17%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop      #15      +/-   ##
===========================================
- Coverage    94.11%   93.93%   -0.18%     
===========================================
  Files            2        2              
  Lines           34       33       -1     
===========================================
- Hits            32       31       -1     
  Misses           2        2

Impacted Files	Coverage Δ
lib/geolocator.dart	80% <100%> (-1.82%)	⬇️
lib/models/position.dart	100% <100%> (ø)	⬆️

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