[Snyk] Upgrade athom-api from 3.1.11 to 3.1.20

Snyk has created this PR to upgrade athom-api from 3.1.11 to 3.1.20.

:information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

The recommended version is 9 versions ahead of your current version.
The recommended version was released 2 months ago, on 2020-01-23.

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mskg / homey-heating

[Snyk] Upgrade athom-api from 3.1.11 to 3.1.20 #158

Snyk has created this PR to upgrade athom-api from 3.1.11 to 3.1.20.