Update CI to use newer Ubuntu

stnguyen90 · stnguyen90 · commit 2d42134a6316 · 2023-07-10T08:00:51.000-07:00
The default Ubuntu has an older version of OpenSSL which is incompatible with urllib3.
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,7 @@
 language: python
 
+dist: bionic
+
 python:
   - "3.8"
 
@@ -13,4 +15,4 @@ jobs:
         username: "__token__"
         password: $PYPI_TOKEN
         on:
-          tags: true
+          tags: true
