Compatibility validator: Pass overwrite.output from project properties

Author: elizarov

binary-compatibility-validator/README.md

@@ -3,4 +3,8 @@
 This module allows to dump and compare public binary API to ensure binary compatibility with a previous version.
 This tool is slightly adapted copy of [original Kotlin compatibility validator](https://github.com/JetBrains/kotlin/tree/master/libraries/tools/binary-compatibility-validator) by @ilya-g.
 
-Refer to the original readme for additional documentation.
+To update public API dumps use:
+
+```bash
+./gradlew :binary-compatibility-validator:test -Poverwrite.output=true 
+```

binary-compatibility-validator/build.gradle

@@ -47,5 +47,6 @@ test {
 
     systemProperty 'testCasesClassesDirs', sourceSets.test.output.classesDirs.asPath
     systemProperty 'testCasesDeclarations', testCasesDeclarationsDump
+    systemProperty 'overwrite.output', project.properties['overwrite.output']
     jvmArgs '-ea'
 }