test against 2018.3 in upm.ci not just promotion

Karl Henkel · Karl Henkel · commit f97a0b0f9ad0 · 2021-01-12T16:18:04.000-05:00
diff --git a/.yamato/upm-ci.yml b/.yamato/upm-ci.yml
@@ -1,4 +1,5 @@
 test_editors:
+  - version: 2018.3
   - version: 2018.4
   - version: 2019.4
   - version: 2020.1
