Update sbt to 1.5.2
diff --git a/project/build.properties b/project/build.properties
index d662015..fd15f59 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -15,4 +15,4 @@
  * limitations under the License.
  */
 
-sbt.version=1.5.1
+sbt.version=1.5.2