Added release note for 1.3.5

doc/release_notes/ProxySQL_v1.3.5.md

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+## ProxySQL v1.3.5
+
+Release date: 2017-03-26
+
+Stable release v1.3.5 , released on 2017-03-26
+
+Compared to v1.3.4, has the following bugs fixed / enhancements:
+
+* General: uninitialized struct addrinfo could cause bind() to fail
+* Query processor: Disable multiplexing for SQL_CALC_FOUND_ROWS #732
+* Connection Pool: Fixed more crashes when using multiple users #897
+* Authentication: Ensure that users num_connections_used does not get increment if connection rejected #942
+* Authentication: Fixed a leak in the number of users connections (wrong counters)
+* MySQL Protocol: Error in fast_forward causes a crash #733
+* Admin: Allow keywords in mysql_users #911
+* Admin: Added status variable ProxySQL_Uptime #947
+* General: double free when handling COM_CHANGE_USER in MariaDB Async Client Library #950
+* MySQL Protocolo: Incorrect processing on date/times and prepared statements #958
+* Monotor: Fix edge case during master/slave promotion #959
+* General: Compile eventslog_reader_sample on CentOS #964
+* Query Processor: Crash on mysql-query_digests=false, mysql-commands_stats=true, and short query #970