Post on slack if it is time for watering

[Circleview]

As Kirstin I want to be notified in slack if the moisture of the plant is dry to perform an immediate watering action.

AC

• [x] I can perform a watering action due to a slack notification.

UAT

• [x] Don't post more than one message per day, even if the soil is dry.
• [x] I can water the plant directly from the notification in slack.
• [x] I receive a mention, if the soil is dry and needs watering.

[Circleview]

SP 2

• [x] Check if the feature is useful by building a rapid prototype with zapier.com

[Circleview]

[Circleview]