fix(ci): install travis perl helpers

Author: Morten Henriksen

.travis.yml

@@ -9,7 +9,12 @@ perl:
   - "5.18"
   - "5.16"
   - "5.14"
+sudo: false
 before_install:
+    - git clone git://github.com/travis-perl/helpers ~/travis-perl-helpers
+    - source ~/travis-perl-helpers/init
+    - build-perl
+    # end of perl version install
     - echo $TRAVIS_PERL_VERSION
     - nvm install $(cat .nvmrc)
     - nvm use $(cat .nvmrc)