Limit perl versions that are run on Travis

.travis.yml

@@ -1,17 +1,12 @@
 language: perl
 perl:
-   - 'blead'
    - '5.20'
    - '5.18'
    - '5.16'
    - '5.14'
    - '5.12'
    - '5.10'
-   - '5.8'
 matrix:
-   allow_failures:
-      - perl: 'blead'
-      - perl: '5.8'
    fast_finish: true
 before_install:
    - export AUTOMATED_TESTING=1 NONINTERACTIVE_TESTING=1 HARNESS_OPTIONS=j10:c HARNESS_TIMER=1

dist.ini

@@ -10,6 +10,7 @@ copyright_year = 2014
 
 [TravisYML]
 build_branch = /cpan|build/
+perl_version = 5.20 5.18 5.16 5.14 5.12 5.10
 dzil_branch =
 test_authordeps = 0
 test_deps = 0