Update README.md

Author: Lich-Corals

README.md

@@ -56,8 +56,8 @@ If you experience any issues with the extension, please report it on the [issues
 If anything is not clear...
 <br/>If you have a problem...
 <br/>If you need a specific feature...
-<br/>If any of your files is not supported...
-<br/><b>...feel free to open an [GitHub issue](https://github.com/Lich-Corals/linux-file-converter-addon/issues/new/choose)!</b>
+<br/>If any of your files are not supported...
+<br/><b>Check if anyone had the same issue before [on this page](https://github.com/Lich-Corals/linux-file-converter-addon/issues?q=) or feel free to open a new [GitHub issue](https://github.com/Lich-Corals/linux-file-converter-addon/issues/new/choose)!</b>
 
 # Credits
 ## Authors