Adjust minimum_os_version in pkginfo to reflect PrinterGenerator's supported macOS version

Author: choules

AddPrinter-Template.plist

@@ -76,7 +76,7 @@ sys.exit(1)
 	<key>installer_type</key>
 	<string>nopkg</string>
 	<key>minimum_os_version</key>
-	<string>10.7.0</string>
+	<string>10.14.0</string>
 	<key>name</key>
 	<string>AddPrinter_DISPLAYNAME</string>
 	<key>preinstall_script</key>