Add changelog entry

doc/changes/changes_1.0.8.md

@@ -1,11 +1,18 @@
-# Exasol Driver go 1.0.8, released 2024-??-??
+# Exasol Driver go 1.0.8, released 2024-06-19
 
 Code name: Fix inserting double values
 
 ## Summary
 
 This release fixes an issue inserting double values with a prepared statement.
 
+Details of the fix:
+The driver serializes commands to the database as JSON. When inserting values into a `DOUBLE` column, the database expects the JSON to contain numbers with a decimal point, e.g. `42.0`. When using values like `42` or `42.0` in `stmt.Exec()`, the driver omitted the decimal point. This caused the query to fail with error
+
+```
+E-EGOD-11: execution failed with SQL error code '00000' and message 'getDouble: JSON value is not a double
+```
+
 ## Bugfixes
 
 * #108: Fixed inserting double values with a prepared statement