[java decompiler] changes feedback address in README

README.md

@@ -2,8 +2,8 @@
 
 Fernflower is the first actually working analytical decompiler for Java and 
 probably for a high-level programming language in general. Naturally it is still 
-under development, please send your bug reports and improvement suggestions at 
-fernflower.decompiler@gmail.com
+under development, please send your bug reports and improvement suggestions to the
+[issue tracker](https://youtrack.jetbrains.com/newIssue?project=IDEA&clearDraft=true&c=Subsystem+Decompiler).
 
 ### Licence