[Sept Sprint] Improve Weather Forecast

[iHiD]

This is part of our September Spring to get the Go Track in shape. Please read the Overview issue for more details. This exercise is unclaimed. To claim it, please comment below.

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Weather Forecast

• weather-forecast: remove golint from introduction #1582
• weather-forecast: unknown variable declaration syntax #1578
• weather-forecast: change function name #1580

[sachinmk27]

I'd like to work on this

[junedev]

@sachinmk27 Thanks for helping with this. Please note that one of the task was already done by someone else and merged. It is marked as closed in the list in the issue description.