Update weathergov.js - new pull request against develop branch

[dgoth]

Fixes #3182

Fixed issue with probability of precipitation not showing up on hourly or daily forecast

Hello and thank you for wanting to contribute to the MagicMirror² project

Please make sure that you have followed these 4 rules before submitting your Pull Request:

1. Base your pull requests against the develop branch.

2. Include these infos in the description:

• Does the pull request solve a related issue?
• If so, can you reference the issue like this Fixes #<issue_number>?
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[dgoth]

Ok I tried creating a new pull request.

Sorry never actually contributed to github before

[rejas]

No worries, there's a first time for everyone :-)

[rejas]

Please also add a CHANGELOG entry