Add SpaceBootstrap option to kotlin-build-gradle-plugin

dependencies/kotlin-build-gradle-plugin/build.gradle.kts

@@ -4,7 +4,7 @@ plugins {
 }
 
 group = "org.jetbrains.kotlin"
-version = "0.0.19"
+version = "0.0.20"
 
 repositories {
     mavenCentral()

dependencies/kotlin-build-gradle-plugin/src/Bootstrap.kt

@@ -69,8 +69,12 @@ sealed class BootstrapOption {
     class BintrayDev(kotlinVersion: String, cacheRedirector: Boolean = false) :
         Custom(kotlinVersion, "https://dl.bintray.com/kotlin/kotlin-dev", cacheRedirector)
 
-    /** Get bootstrap from kotlin bootstrap space repo, where bootstraps are published */
+    /** Get bootstrap from kotlin-bootstrap bintray repo, where bootstraps are published */
     class BintrayBootstrap(kotlinVersion: String, cacheRedirector: Boolean = false) :
+        Custom(kotlinVersion, "https://dl.bintray.com/kotlin/kotlin-bootstrap", cacheRedirector)
+
+    /** Get bootstrap from kotlin bootstrap space repo, where bootstraps are published */
+    class SpaceBootstrap(kotlinVersion: String, cacheRedirector: Boolean = false) :
         Custom(kotlinVersion, "https://maven.pkg.jetbrains.space/kotlin/p/kotlin/bootstrap", cacheRedirector)
 
     /** Get bootstrap from teamcity maven artifacts of the specified build configuration
@@ -114,4 +118,4 @@ sealed class BootstrapOption {
             project.bootstrapKotlinVersion = kotlinVersion ?: project.property("defaultSnapshotVersion") as String
         }
     }
-}
+}