Update ISSUE_TEMPLATE

Author: nick-zh

.github/ISSUE_TEMPLATE

@@ -1,18 +1,16 @@
 <!--
-Thank you for creating a ticket!
+Before submitting an issue, search your error in the issues of librdkafka: https://github.com/edenhill/librdkafka/issues
+Since this extension is a wraper, solutions to many errors can be found there.
 
-If you have questions, you can also join the Gitter channel.
-https://gitter.im/php-kafka/php-kafka
-
-Please always include the following in an issue, so we can help faster:
+Please always include the following in an issue:
 -->
 
  * PHP version:
  * librdkafka version:
  * php-kafka version:
  * kafka version:
 
-If possible, add debug logs from librdkafka, which you can obtain by adjusting your configuration:
+Add debug logs, by adjusting your configuration:
 ```php
 <?php
 $conf = new Kafka\Configuration();