Merge pull request #25 from sullis/sbt170

sbt 1.7.1
diff --git a/project/build.properties b/project/build.properties
index 74f7c4e..724f3e6 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -15,4 +15,4 @@
 # limitations under the license.
 #
 
-sbt.version=1.6.2
+sbt.version=1.7.1