Upgrade to sbt 0.13.15

smarter · smarter · commit 1876e5533f17 · 2017-04-10T20:10:12.000+02:00
diff --git a/project/build.properties b/project/build.properties
@@ -1 +1 @@
-sbt.version=0.13.14-RC2
+sbt.version=0.13.15
