README: remove obsolete mention of Google

The caveat that CUE is "not an officially supported Google product" is
unnecessary, after the 2021 move from github.com/cuelang/* to
github.com/cue-lang/*. cf. cuelang/cue#1078.

Signed-off-by: Jonathan Matthews <github@hello.jonathanmatthews.com>
Change-Id: Ib140b6e4b4f5545a726648eaadd4f68477f9187e
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1176405
Reviewed-by: Paul Jolly <paul@myitcv.io>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: CUEcueckoo <cueckoo@gmail.com>

README.md

@@ -160,5 +160,3 @@ You can get in touch with the cuelang community in the following ways:
 Unless otherwise noted, the CUE source files are distributed
 under the Apache 2.0 license found in the LICENSE file.
 
-This is not an officially supported Google product.
-