Removing pretty_inspect since it doesn't seem to add any additional i…

…nformation to the error and it currently causes compilation errors on Windows. Fixes #1928

src/lucky/errors.cr

@@ -249,7 +249,7 @@ module Lucky
         "Expected request to have a subdomain but did not find one."
       else
         <<-MESSAGE
-          Expected subdomain matcher(s): #{@expected.pretty_inspect}
+          Expected subdomain matcher(s): #{@expected}
           Did not match host: #{@host}
         MESSAGE
       end