Fix failing publication validation

Author: dkhalanskyjb

publication-validator/src/test/kotlin/kotlinx/coroutines/tools/MavenPublicationValidator.kt

@@ -5,6 +5,7 @@
 package kotlinx.coroutines.validator
 
 import org.junit.*
+import org.junit.Assert.assertTrue
 import java.io.*
 import java.util.jar.*
 

publication-validator/src/test/kotlin/kotlinx/coroutines/tools/NpmPublicationValidator.kt

@@ -9,6 +9,7 @@ import org.apache.commons.compress.archivers.tar.*
 import org.junit.*
 import java.io.*
 import java.util.zip.*
+import org.junit.Assert.*
 
 class NpmPublicationValidator {
     private val VERSION = System.getenv("DeployVersion")