Updated README.ms changed 'hunidity' to 'humidity'

[juggledad]

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Proposed changes

Fixed typo in README.md for openweathermap node in the '5 day Forecast will return a 5 part array, each with' section
'humidity' was spelled 'hunidity'

Checklist

• [x ] I have read the contribution guidelines
• [na/ ] For non-bugfix PRs, I have discussed this change on the forum/slack team.
• [n/a ] I have run grunt to verify the unit tests pass
• [n/a ] I have added suitable unit tests to cover the new/changed functionality