removed obsolete known issue

README.MD

@@ -37,7 +37,6 @@ See the extension help in the options page for more detailed information about t
 ## Known Issues
 - All browsers:
   - For security reasons, you cannot save pages hosted on https://chrome.google.com or https://addons.mozilla.org.
-  - Frame contents cannot be saved when "auto-save on page unload" option is checked.
 - Chrome/Opera:
   - You must enable the option "Allow access to file URLs" in the extension page to display the infobar when viewing a saved page, or to save a page stored on the filesystem.
   - If saved pages have file names like "4e5a13fd-6638-4a37-a34b-a3c104ac66b1" instead of the title then it means another extension is conflicting with SingleFile. You can uncheck the option "save pages in background" to circumvent this issue.

extension/ui/pages/help.html

@@ -306,7 +306,6 @@
 						All browsers
 						<ul>
 							<li>For security reasons, you cannot save pages hosted on https://chrome.google.com or https://addons.mozilla.org.</li>
-							<li>Frame contents cannot be saved when "auto-save on page unload" option is checked.</li>
 						</ul>
 					</li>
 					<li>