chore: clarify that breaking changes are for experimental APIs (aws#9876

)

Change the "BREAKING CHANGES" header in the CHANGELOG to
"BREAKING CHANGES TO EXPERIMENTAL FEATURES" to make it sure that
stable features are not being broken.


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*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

bump.sh

@@ -21,3 +21,13 @@ echo "Starting ${version} version bump"
 
 # Generate CHANGELOG and create a commit (see .versionrc.json)
 npx standard-version --release-as ${version}
+
+# I am sorry.
+#
+# I've gone diving through the code of `conventional-changelog` to see if there
+# was a way to configure the string and ultimately I decided that a 'sed' was the simpler
+# way to go.
+sed -i.tmp -e 's/BREAKING CHANGES$/BREAKING CHANGES TO EXPERIMENTAL FEATURES/' CHANGELOG.md
+rm CHANGELOG.md.tmp
+git add CHANGELOG.md
+git commit --amend --no-edit