Fix readme

readme.md

@@ -25,7 +25,7 @@ Mainly meant to be used for images from scripts like open-screeny.sh, it can rea
 
 Required dependencies are openssl, curl, and standard unix utilities stat, awk, and basename
 
-Optional dependencies include aesgcm from [ImageDownloader][6] which is used to encrypt files just like Conversations and gajim do with http_upload before upload. Either set the variable http_upload_encrypt to 1 or pass -e to the script as the first or second argument to enable this encryption.
+Optional dependencies include aesgcm from [ImageDownloader][7] which is used to encrypt files just like Conversations and gajim do with http_upload before upload. Either set the variable http_upload_encrypt to 1 or pass -e to the script as the first or second argument to enable this encryption.
 
 imgup.sh
 ------------
@@ -49,4 +49,4 @@ nginx_http_upload.php is licensed seperately as mentioned at the top of the file
 [4]: http://b1t.it/
 [5]: https://github.com/Hidendra/puush-api
 [6]: https://modules.prosody.im/mod_http_upload_external.html
-[7]: https://github.com/moparisthebest/ImageDownloader
+[7]: https://github.com/moparisthebest/ImageDownloader