Update build to sbt 0.13.13

mrerrormessage · mrerrormessage · commit 2a5e4c5b3fec · 2017-02-27T14:15:53.000-06:00
diff --git a/build.sbt b/build.sbt
@@ -1,6 +1,6 @@
 enablePlugins(org.nlogo.build.NetLogoExtension, org.nlogo.build.ExtensionDocumentationPlugin)
 
-javaSource in Compile <<= baseDirectory(_ / "src")
+javaSource in Compile := baseDirectory.value / "src"
 
 name := "array"
 
diff --git a/project/build.properties b/project/build.properties
@@ -1 +1 @@
-sbt.version=0.13.9
+sbt.version=0.13.13
