change Perl versions for travis

.travis.yml

@@ -1,20 +1,19 @@
 language: perl
 perl:
-  - "5.24"
   - "5.22"
-  - "5.20"
-  - "5.18"
-  - "5.16"
-  - "5.14"
-  - "5.12"
-  - "5.10"
-  - "5.8"
+  - "5.24"
+  - "5.26"
+  - "5.28"
+  - "5.30"
 
+before_install:
+  - cpanm --quiet --notest Devel::Cover
+  - cpanm --quiet --notest Devel::Cover::Report::Coveralls
+
 install:
   - export RELEASE_TESTING=1 AUTOMATED_TESTING=1 AUTHOR_TESTING=1 HARNESS_OPTIONS=c HARNESS_TIMER=1
-  - cpanm --quiet --notest Devel::Cover::Report::Coveralls
   - cpanm --quiet --notest --installdeps --with-develop .
-
+  
 script:
   - PERL5OPT=-MDevel::Cover='-coverage,statement,branch,condition,path,subroutine,+ignore,bin/prove\b,t/author' prove -lrsv t
   - cover