Update README.md

Author: ghislainfourny

README.md

@@ -22,6 +22,8 @@ Alternatively, it is possible to directly get an RDD of Python-friendly JSON val
 
 The design goal is that it should be possible to chain DataFrames between JSONiq and Spark SQL queries seamlessly. For example, JSONiq can be used to clean up very messy data and turn it into a clean DataFrame, which can then be processed with Spark SQL, spark.ml, etc.
 
+Any feedback or error reports are very welcome.
+
 ## Installation
 
 Install with