Use dev version of 3.9

Faustasm · Faustasm · commit 5f0e02bab149 · 2020-10-23T12:59:55.000+03:00
diff --git a/.travis.yml b/.travis.yml
@@ -13,7 +13,7 @@ matrix:
   allow_failures:
   - python: "nightly"
   include:
-    - python: "3.9"
+    - python: "3.9-dev"
       dist: focal
 
 dist: bionic
