travis: move to bionic

.travis.yml

@@ -1,5 +1,5 @@
 ---
-dist: trusty
+dist: bionic
 install:
   - sudo apt-get update
   - sudo apt-get --no-install-recommends install devscripts python python3 ruby php5-cli gawk ksh zsh pylint shellcheck
@@ -32,7 +32,7 @@ install:
   - cpanm --notest FCGI::Client
   - cpanm --notest File::ReadBackwards
   - cpanm --notest Graphics::ColorObject
-  - cpanm --notest Graphics::ColorNames
+  - cpanm --notest Graphics::ColorNames::HTML
   - cpanm --notest IPC::Run3
   - cpanm --notest IPC::ShareLite
   - cpanm --notest JSON