Docs: Add info about Sizzle not being excludable on the compat branch

Most people just read the README that's displayed to them on GitHub which
is the one for the master branch. Let's include the info about Sizzle
not being excludable there.

Fixes gh-2184

diff --git a/README.md b/README.md
index 074db3865ed5cf3003be7ddc4d8951100105553a..e999a8c5534b2db994a79edf1ae5d757e9748f4c 100644 (file)
--- a/README.md
+++ b/README.md
@@ -100,6 +100,8 @@ As a special case, you may also replace Sizzle by using a special flag `grunt cu
 
 *Note*: Excluding Sizzle will also exclude all jQuery selector extensions (such as `effects/animatedSelector` and `css/hiddenVisibleSelectors`).
 
+*Note*: Removing Sizzle is not supported on the `compat` branch.
+
 The build process shows a message for each dependent module it excludes or includes.
 
 ##### AMD name