common: Fix ubuntu version in build test
drwxr-xr-x - .github
-rw-r--r-- 33 .gitignore
-rw-r--r-- 622 .travis.yml
-rw-r--r-- 496 AUTHORS
-rw-r--r-- 2961 CONTRIBUTING.md
-rw-r--r-- 1053 LICENSE
-rw-r--r-- 8083 README.md
drwxr-xr-x - inc
-rw-r--r-- 1520 meson.build
-rw-r--r-- 956 meson_options.txt
drwxr-xr-x - packaging
drwxr-xr-x - pc
drwxr-xr-x - res
drwxr-xr-x - src
drwxr-xr-x - test
-rw-r--r-- 67 thorvg.manifest
drwxr-xr-x - tools
-rwxr-xr-x 584 wasm_build.sh
-rw-r--r-- 588 wasm_cross.txt