Change LOCAL_SDK_VERSION from current to 8

Change-Id: Id6f8a8168b1833b5074e68fa22a8134c808960a4
diff --git a/Android.mk b/Android.mk
index 8e0935b..6253248 100644
--- a/Android.mk
+++ b/Android.mk
@@ -16,7 +16,7 @@
 include $(CLEAR_VARS)
 
 LOCAL_MODULE := guava
-LOCAL_SDK_VERSION := current
+LOCAL_SDK_VERSION := 8
 LOCAL_SRC_FILES := $(call all-java-files-under, src)
 LOCAL_STATIC_JAVA_LIBRARIES := jsr305