Add module version numbers to Perl modules that might need them

src/tools/EPICS/PodHtml.pm

@@ -5,6 +5,8 @@ use warnings;
 
 use base 'Pod::Simple::HTML';
 
+our $VERSION = '1.2.1';
+
 sub encode_entities {
     my ($self, $str) = @_;
     my %entities = (

src/tools/EPICS/PodMD.pm

@@ -7,6 +7,8 @@ use warnings;
 
 use base 'Pod::Markdown';
 
+our $VERSION = '1.1.1';
+
 # Translate L<link text|filename/Section name>
 # into <a href="filename.md#section-name">link text</a>#
 # This is for Sphinx processing on Readthedocs. Sphinx converts

src/tools/EPICS/PodXHtml.pm

@@ -5,6 +5,8 @@ use warnings;
 
 use base 'Pod::Simple::XHTML';
 
+our $VERSION = '1.2.1';
+
 BEGIN {
     if ($Pod::Simple::XHTML::VERSION < '3.16') {
         # Add encode_entities() as a method