Update README.md

Update connector logo

Signed-off-by: Maikel-B <Maikel.Baars@gmail.com>

Author: Maikel-B

README.md

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 # HelloID-Conn-Prov-Source-SQL
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+<br />
+<p align="center"> 
+  <img src="https://www.tools4ever.nl/connector-logos/sql-logo.png">
+</p>
 # HelloID Docs
 The official HelloID documentation can be found at: https://docs.helloid.com/