CI: travis-ci: switch to Ubuntu 20.04

we were blocked by https://github.com/vtest/VTest/issues/20
issue is resolved, let us update to focal

diff --git a/.travis.yml b/.travis.yml
index e73d40c3303ebcf77f77b1cc3c5223e8f93bf643..b32de97a17975096d1d43fcddb45c1282c4cbbac 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,6 @@
 # build status appears on https://travis-ci.com/haproxy/haproxy
 
-dist: bionic
+dist: focal
 
 language: c
 
@@ -19,7 +19,7 @@ env:
 addons:
   apt:
     update: true
-    packages: [ liblua5.3-dev, libsystemd-dev, libpcre2-dev, clang-9, socat, ninja-build ]
+    packages: [ liblua5.3-dev, libsystemd-dev, libpcre2-dev, clang-9, socat, ninja-build, libpcre3-dev ]
 
 cache:
   directories: