Update README.md

Author: kshchepanovskyi

README.md

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 ## Google Protocol Buffers support for JetBrains IDEs
 
-Google Protobuf Plugin for IntelliJ IDEA & other JetBrains products.
+[Protobuf Support Plugin](https://plugins.jetbrains.com/plugin/8277) for IntelliJ IDEA & other JetBrains products.
 
 Based on [antlr4-jetbrains-adapter](https://github.com/antlr/jetbrains/) and ANTLR 4 grammar from [protostuff-compiler](https://github.com/protostuff/protostuff-compiler/tree/master/protostuff-parser/src/main/antlr4/io/protostuff/compiler/parser).