fix jpg link

README.md

@@ -23,11 +23,11 @@ Popup to enter your connection details.
 Button injected on video page to download the video or subscribe to the channel.
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-![search page](assets/tac-screenshot-search.png?raw=true "Tube Archivist Companion Search Page")
+![search page](assets/tac-screenshot-search.jpg?raw=true "Tube Archivist Companion Search Page")
 Download button injected showing when hovering over top left corned of thumbnail
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-![channel page](assets/tac-screenshot-channel.png?raw=true "Tube Archivist Companion Channel Page")
+![channel page](assets/tac-screenshot-channel.jpg?raw=true "Tube Archivist Companion Channel Page")
 Channel button injected to subscribe or download whole channel, video download button showing when hovering over topleft corner of thumbnail.
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