Node 13 is EOL.

XmiliaH · web-flow · commit b5e2bb095a50 · 2021-04-21T00:19:16.000+02:00
We only use even node versions.
diff --git a/.travis.yml b/.travis.yml
@@ -5,5 +5,4 @@ node_js:
   - "8"
   - "10"
   - "12"
-  - "13"
   - "14"

-Original file line number
+Diff line change
   - "8"
   - "10"
   - "12"
 -  - "13"
   - "14"