use dist:focal = ubuntu 20.04

erossignon · erossignon · commit 5445710037ad · 2020-08-15T11:48:21.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -50,6 +50,7 @@ addons:
     - libtbb2
     - libtbb-dev
     - libocct-modeling-algorithms-dev
+    update: true
   homebrew:
     packages:
     - tbb
