SBT version upgraded from 0.13.8 to latest 0.13.9.

gslowikowski · gslowikowski · commit 40bd4b28e40f · 2016-01-31T11:30:16.000+01:00
diff --git a/project/build.properties b/project/build.properties
@@ -1 +1 @@
-sbt.version=0.13.8
+sbt.version=0.13.9
