fix previous commit by replacing two spaces with one tab

* the previous commit tried to fix the docker-push target, but failed to
  do so because instead of the required "tab" character, it added two
  spaces as indentation
* this commit replaces the two spaces with one tab character
* increase the VERSION to v3.4.8 to tag and publish a new artifact after
  fixing the docker-push target

Signed-off-by: Jan Klare <jan.klare@bisdn.de>
Change-Id: I52b422120637bd8fb84ab8525c8e6c007e2baaaf
diff --git a/Makefile b/Makefile
index 0aaa8d0..22f53de 100644
--- a/Makefile
+++ b/Makefile
@@ -118,7 +118,7 @@
 
 	$(call banner-enter,$@)
 
-  docker push ${RWCORE_IMAGENAME}:${DOCKER_TAG}
+	docker push ${RWCORE_IMAGENAME}:${DOCKER_TAG}
 ifdef BUILD_PROFILED
 	docker push ${RWCORE_IMAGENAME}:${DOCKER_TAG}-profile
 endif