Update README.md

Author: kshchepanovskyi

README.md

@@ -1,5 +1,4 @@
-## Protobuf Support for JetBrains IDEs
-
+## ![Icon](https://github.com/protostuff/protobuf-jetbrains-plugin/raw/master/src/main/resources/io/protostuff/protobuf-jetbrains-plugin/icons/proto%402x.png) Protobuf Support for JetBrains IDEs
 
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