Merge pull request #6 from cdzombak/devin/1749519788-update-golangci-…

…lint

Update golangci-lint to v2.1.6 and fix linting errors

clamp average direction degree results to (0, 360]

add WeightedStdDevDirectionDeg

add validation for heat index fns

improve heat index docs in README

add new calculations to README

add meters

initial commit