问如何将Kotlin源码的测试报告上传到Coveralls？

EN

> Task :coveralls
No source file found on the project: "kotlin-template-project"
With coverage file: /home/travis/build/myname/myreponame/build/reports/jacoco/test/jacocoTestReport.xml

coveralls {
    sourceDirs += allprojects.sourceSets.main.allSource.srcDirs.flatten()
    sourceDirs += files(sourceSets.main.kotlin.srcDirs).files.absolutePath
    project.extensions.coveralls.sourceDirs += project.sourceSets.main.kotlin.srcDirs
    sourceDirs += ['src/main/kotlin']
    jacocoReportPath = 'build/reports/jacoco/test/jacocoTestReport.xml'
    sourceDirs += ['src/test/kotlin']
    sourceDirs += ["${projectDir}/src/main/kotlin"]
}

plugins {

    id 'org.jetbrains.kotlin.jvm' version '1.2.50'
    id 'java' // Required by at least JUnit.

    // Test coverage
    id 'jacoco'

    // Upload jacoco coverage reports to coveralls
    id 'com.github.kt3k.coveralls'  version '2.8.2'
}

dependencies {
    compile 'org.jetbrains.kotlin:kotlin-stdlib-jdk8'

    // JUnit 5
    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.2.0'
    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.2.0'
    testRuntime 'org.junit.platform:junit-platform-console:1.2.0'

    // Kotlintest
    testCompile 'io.kotlintest:kotlintest-core:3.1.6'
    testCompile 'io.kotlintest:kotlintest-assertions:3.1.6'
    testCompile 'io.kotlintest:kotlintest-runner-junit5:3.1.6'

    // Spek
    testCompile 'org.jetbrains.spek:spek-api:1.1.5'
    testRuntime 'org.jetbrains.spek:spek-junit-platform-engine:1.1.5'
}

repositories {
    mavenCentral()
    mavenLocal()
    jcenter()
}

test {
    // Enable JUnit 5 (Gradle 4.6+).
    useJUnitPlatform()

    // Always run tests, even when nothing changed.
    dependsOn 'cleanTest'

    // Show test results.
    testLogging {
        events "passed", "skipped", "failed"
    }
}

// Test coverage reporting
jacocoTestReport {
    // Enable xml for coveralls.
    reports {
        html.enabled = true
        xml.enabled = true
        xml.setDestination(file("${buildDir}/reports/jacoco/test/jacocoTestReport.xml"))
    }
}

coveralls {
    sourceDirs += ['src/main/kotlin']
    jacocoReportPath = 'build/reports/jacoco/test/jacocoTestReport.xml'
}