Prepare webkit for 1.5.0-rc01 release

There has been no API changes since the beta release.

Change-Id: I537d5a4c87a42e9deec371cb25ed6fe3f949b320
diff --git a/libraryversions.toml b/libraryversions.toml
index 80909c7..c844c09 100644
--- a/libraryversions.toml
+++ b/libraryversions.toml
@@ -128,7 +128,7 @@
 WEAR_REMOTE_INTERACTIONS = "1.1.0-alpha01"
 WEAR_TILES = "1.1.0-alpha10"
 WEAR_WATCHFACE = "1.2.0-alpha01"
-WEBKIT = "1.5.0-beta02"
+WEBKIT = "1.5.0-rc01"
 WINDOW = "1.1.0-alpha03"
 WINDOW_EXTENSIONS = "1.1.0-alpha01"
 WINDOW_SIDECAR = "1.0.0-rc01"