Update .travis.yml

labsquare#98  Move to Qt 5.12

Author: dridk

.travis.yml

@@ -1,16 +1,16 @@
 language: cpp
-dist: trusty
+dist: bionic
 compiler: g++
 sudo: required
 
 before_install:
-  - sudo add-apt-repository ppa:beineri/opt-qt58-trusty -y
+  - sudo add-apt-repository ppa:beineri/opt-qt-5.12.0-bionic -y
   - sudo apt-get update
   - git submodule update --init --recursive
 
 install:
-  - sudo apt-get install qt58base qt58svg qt58charts-no-lgpl
-  - source /opt/qt58/bin/qt58-env.sh
+  - sudo apt-get install qt512base qt512svg qt512charts-no-lgpl
+  - source /opt/qt512/bin/qt512-env.sh 
 
 
 script: