Prepare v1.3.4-rc2: update CHANGELOG

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/Makefile b/Makefile
index 0f54121..3179c67 100644
--- a/Makefile
+++ b/Makefile
@@ -24,7 +24,7 @@
 VERSION = 1
 PATCHLEVEL = 3
 SUBLEVEL = 4
-EXTRAVERSION = -rc1
+EXTRAVERSION = -rc2
 U_BOOT_VERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 VERSION_FILE = $(obj)include/version_autogenerated.h