add week 31 task 1 solution

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diff --git a/challenge-031/steven-wilson/perl5/ch-1.pl b/challenge-031/steven-wilson/perl5/ch-1.pl
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+#!/usr/bin/env perl
+# Author: Steven Wilson
+# Date: 2019-10-22
+# Week: 031
+
+# Task #1
+# Create a function to check divide by zero error without checking if
+# the denominator is zero.
+
+use strict;
+use warnings;
+use feature qw/ say /;
+use Test::More;
+
+ok( is_divide_by_zero( 1, 0 ) == 1, "Test zero denominator" );
+ok( is_divide_by_zero( 1, 1 ) == 0, "Test non-zero denominator" );
+done_testing();
+
+sub is_divide_by_zero {
+    my ( $numerator, $denominator ) = @_;
+    eval { my $answer = $numerator / $denominator; };
+    if ( $@ =~ /Illegal division by zero/ ) {
+        return 1;
+    }
+    else {
+        return 0;
+    }
+}