logging: use stderr by default

Signed-off-by: Alexander Bezzubov <[email protected]>

Author: bzz

src/main/scala/org/bblfsh/client/v2/libuast/Libuast.scala

@@ -14,7 +14,7 @@ object Libuast {
   final var loaded = false
 
   if (!loaded) {
-    println("Loading native libscalauast")
+    System.err.println("Loading native libscalauast")
     Libuast.loadBinaryLib("libscalauast")
   }
 

src/test/scala/org/bblfsh/client/v2/FilterManagedTest.scala

@@ -19,7 +19,7 @@ class FilterManagedTest extends FlatSpec
     ))
 
   override def beforeAll() = {
-    println(s"Libuast.loaded: ${Libuast.loaded}")
+    System.err.println(s"Libuast.loaded: ${Libuast.loaded}")
     // to load native JNI lib \wo the full client
   }