fix: remove non-existing dockeri.co link

Signed-off-by: Felipe Zipitria <felipe.zipitria@owasp.org>

Author: fzipi

README.md

@@ -1,7 +1,5 @@
 # OWASP CRS Docker Image
 
-[![dockeri.co](http://dockeri.co/image/owasp/modsecurity-crs)](https://hub.docker.com/r/owasp/modsecurity-crs/)
-
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