Add entry about TEST_TAGS in the developer changelog (elastic#17140)

(cherry picked from commit 5332b10)
jsoriano · Mar 20, 2020 · 5421f4b · 5421f4b
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commit 5421f4b
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diff --git a/CHANGELOG-developer.next.asciidoc b/CHANGELOG-developer.next.asciidoc
@@ -66,3 +66,4 @@ The list below covers the major changes between 7.0.0-rc2 and master only.
 - Compare event by event in `testadata` framework to avoid sorting problems {pull}13747[13747]
 - Added a `default_field` option to fields in fields.yml to offer a way to exclude fields from the default_field list. {issue}14262[14262] {pull}14341[14341]
 - `supported-versions.yml` can be used in metricbeat python system tests to obtain the build args for docker compose builds. {pull}14520[14520]
+- Add support for a `TEST_TAGS` environment variable to add tags for tests selection following go build tags semantics, this environment variable is used by mage test targets to add build tags. Python tests can also be tagged with a decorator (`@beat.tag('sometag')`). {pull}16937[16937] {pull}17075[17075]