Include associated perl version change in generated .travis.yml

.travis.yml

@@ -1,7 +1,11 @@
 language: perl
 perl:
-   - 5.12
+   - 5.19
+   - 5.18
    - 5.16
+   - 5.14
+   - 5.12
+   - 5.10
 before_install:
    - export AUTOMATED_TESTING=1 HARNESS_OPTIONS=j10:c HARNESS_TIMER=1
    - git config --global user.name "TravisCI"