Bump version string for release

Change-Id: Ic6733a49d2237c8f5952b9e04e7c042d212b8c95
diff --git a/VERSION b/VERSION
index f263cd1..88d3ee7 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.8.6
+1.8.7