Merge pull request #3935 from morozov/deprecate-echo-sql-logger

Deprecate EchoSQLLogger

UPGRADE.md

 # Upgrade to 2.11
 
+## Deprecated `EchoSQLLogger`
+
+The `EchoSQLLogger` is has been deprecated. Implement your logger with the desired logic.
+
 ## Deprecated database platforms:
 
 1. PostgreSQL 9.3 and older

lib/Doctrine/DBAL/Logging/EchoSQLLogger.php

@@ -7,6 +7,8 @@ use function var_dump;
 
 /**
  * A SQL logger that logs to the standard output using echo/var_dump.
+ *
+ * @deprecated
  */
 class EchoSQLLogger implements SQLLogger
 {