Update SKP version to 88

Automatic commit by the RecreateSKPs bot.

TBR=

Author: borenet@google.com

Review URL: https://codereview.chromium.org/520323002
diff --git a/SKP_VERSION b/SKP_VERSION
index eaf7a13..9f72858 100644
--- a/SKP_VERSION
+++ b/SKP_VERSION
@@ -1 +1 @@
-87
\ No newline at end of file
+88
\ No newline at end of file