add pragmas and stuff

Author: karenetheridge

t/lib/Helper.pm

@@ -1,6 +1,15 @@
 use strictures 2;
 # no package, so things defined here appear in the namespace of the parent.
 
+use 5.020;
+use stable 0.031 'postderef';
+use experimental 'signatures';
+use if "$]" >= 5.022, experimental => 're_strict';
+no if "$]" >= 5.031009, feature => 'indirect';
+no if "$]" >= 5.033001, feature => 'multidimensional';
+no if "$]" >= 5.033006, feature => 'bareword_filehandles';
+use open ':std', ':encoding(UTF-8)'; # force stdin, stdout, stderr into utf8
+
 use JSON::PP ();
 use constant { true => JSON::PP::true, false => JSON::PP::false };