update for minimum v5.22

.travis.yml

@@ -1,13 +1,12 @@
+# brian's standard Travis CI config for Perl 5 modules
+# https://github.com/briandfoy/brians_perl_modules_travis_config
+# This file is licensed under the Artistic License 2.0
+
+# modified because the minimum Perl version is v5.22 for this module
 sudo: false
 
 language: perl
 perl:
-    - "5.10"
-    - "5.12"
-    - "5.14"
-    - "5.16"
-    - "5.18"
-    - "5.20"
     - "5.22"
     - "5.24"
     - "5.26"
@@ -18,6 +17,7 @@ before_install:
 
 install:
     - cpanm --quiet --installdeps --notest .
+    - cpanm --quiet --notest Devel::Cover
     - cpanm --quiet --notest Devel::Cover::Report::Coveralls
 
 script: