fix verify in Julia 1.3

Author: minrk

tests/julia/project-binder-dir/verify

@@ -1,7 +1,7 @@
 #!/usr/bin/env julia
 
-if VERSION != v"1.3.1"
-    println("Julia version should be 1.3.1")
+if VERSION != v"1.3"
+    println("Julia version should be 1.3, got $VERSION")
     exit(1)
 end