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Commits on Sep 1, 2023
fix: link url
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doc: observer example
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doc: UML diagram
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doc: UML diagram
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doc: Add file running instructions, format markdown
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doc: Update my thoughts on the observer design pattern
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feature: Add the heat index display
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feature: Complete the weather station code
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reformatting with black
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formatting
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Observer weather station example from chapter 2
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