Try to use cpanm to install licensecheck

.ci/travis/code_layout/before_install.sh

@@ -17,4 +17,4 @@ pip install autopep8 nose2 mock termcolor
 
 export PERL_MM_USE_DEFAULT=1
 export PERL_EXTUTILS_AUTOINSTALL="--defaultdeps"
-perl -MCPAN -e "CPAN::Shell->notest('install', 'App::Licensecheck')"
+cpanm --notest App::Licensecheck

.travis.yml

@@ -55,6 +55,7 @@ matrix:
             - expect-dev  # unbuffer
             - coreutils
             # dependencies for licensecheck
+            - cpanminus
             - libyaml-tiny-perl
             - libio-socket-ssl-perl
             - libhttp-date-perl