Update build information in README.md

After the project swtiched from gradle to maven, this commit updates the README.md to reflect on the new build command 'mvn package'.
lynxplay · Oct 1, 2019 · 554514a · 554514a
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commit 554514a
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/README.md b/README.md
@@ -7,7 +7,7 @@ Installation
 
 The plugin is based on the maven build tools, so you can easily install it using  
 ```bash
-gradle build
+mvn package
 ```
 The final output jar will be located in the `target` folder.