added badge for the last success CI test on master

hpsaturn · hpsaturn · commit de46fac3e5e5 · 2022-01-31T00:34:13.000+01:00
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 # InfluxDB Arduino Client
 
 Simple Arduino client for writing and reading data from [InfluxDB](https://www.influxdata.com/products/influxdb-overview/), no matter whether it is a local server or InfluxDB Cloud. The library supports authentication, secure communication over TLS, [batching](#writing-in-batches), [automatic retrying](#buffer-handling-and-retrying) on server back-pressure and connection failure.

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`1`	`3`	`# InfluxDB Arduino Client`
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`3`	`5`	`Simple Arduino client for writing and reading data from [InfluxDB](https://www.influxdata.com/products/influxdb-overview/), no matter whether it is a local server or InfluxDB Cloud. The library supports authentication, secure communication over TLS, [batching](#writing-in-batches), [automatic retrying](#buffer-handling-and-retrying) on server back-pressure and connection failure.`