Add a hack to push module metadata to bintray

From bintray/gradle-bintray-plugin#229

build.gradle.kts

@@ -5,7 +5,7 @@ plugins {
 }
 
 group = "org.araqnid.kotlin.arg-parser"
-version = "0.0.1"
+version = "0.0.2"
 
 repositories {
     jcenter()
@@ -52,6 +52,21 @@ kotlin {
 dependencies {
 }
 
+tasks.withType<com.jfrog.bintray.gradle.tasks.BintrayUploadTask> {
+    doFirst {
+        publishing.publications
+            .filterIsInstance<MavenPublication>()
+            .forEach { publication ->
+                val moduleFile = buildDir.resolve("publications/${publication.name}/module.json")
+                if (moduleFile.exists()) {
+                    publication.artifact(object : org.gradle.api.publish.maven.internal.artifact.FileBasedMavenArtifact(moduleFile) {
+                        override fun getDefaultExtension() = "module"
+                    })
+                }
+            }
+    }
+}
+
 bintray {
     user = (project.properties["bintray.user"] ?: "").toString()
     key = (project.properties["bintray.apiKey"] ?: "").toString()