Try more appveyor on Linux

.appveyor.yml

@@ -24,11 +24,12 @@ install:
   # - cmd: cd C:\projects\%APPVEYOR_PROJECT_NAME%
   - sh: sudo apt-get update -q -y
   - sh: sudo DEBIAN_FRONTEND=noninteractive apt-get install -q -y --force-yes build-essential git libssl-dev perl
+  - sh: sudo apt-get install -y cpanminus
   - sh: export PATH=/home/appveyor/perl5/bin:$PATH
   - perl -V
   - cmd: mkdir %APPVEYOR_BUILD_FOLDER%\tmp
   - cmd: set TMPDIR=%APPVEYOR_BUILD_FOLDER%\tmp
-  - cpan App::cpanminus
+  - cmd: cpan App::cpanminus
   - cpanm -iqn --skip-satisfied Carp Data::Throttler CGI::IDS Data::Validate::URI DateTime LWP::Simple::WithCache XML::LibXML B::Lint warnings::unused
   - cmd: 'echo End install at: & time /t'