Update README.md

README.md

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 Accepts sensor data and saves them into a database. The saved data can be accessed via api.
 
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+## Installation on Raspberry Pi Zero
+- pipenv is causing some problems
+- use pipenv 2018-11-26
+- run `pipenv lock`
+- open `Pipfile.lock` and remove the `gevent` dependency
+- run `Pipenv sync`
+- install gevent manually via `pipenv install gevent`
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