Bump kotlinx-io version to 0.8.0

Author: fzhinkin

.teamcity/BuildParams.kt

@@ -21,7 +21,7 @@ object BuildParams {
   const val KOTLINX_DATETIME_TITLE = KOTLINX_DATETIME_ID
 
   const val KOTLINX_IO_RELEASE_TAG = "master"
-  const val KOTLINX_IO_RELEASE_LABEL = "0.7.0"
+  const val KOTLINX_IO_RELEASE_LABEL = "0.8.0"
   const val KOTLINX_IO_ID = "kotlinx-io"
   const val KOTLINX_IO_TITLE = KOTLINX_IO_ID