fix typo that made instructions not work

README.markdown

@@ -13,7 +13,7 @@ If you just want some colorted diagrams, go to [https://github.com/cayennes/kanj
 To add these to a kanji deck:
 
 1. Unzip the downloaded collection and put the contents in your deck's .media folder (which is most likely in your Dropbox/Public/Anki folder if you sync media or next to your deck at [My ]Documents/Anki)
-2. Add `<img src={{{text:Kanji}}}.png>` to your card template, where Kanji is the name of a field that contains a single kanji character.
+2. Add `<img src={{{text:Kanji}}}.svg>` to your card template, where Kanji is the name of a field that contains a single kanji character.
 3. If you use anki on multiple devices, you may need to run "Tools >> Advanced >> Check Media Database..." to get them to sync properly. If you want to clear out the unused SVGs, which there will be a ton of, use scan + delete. But use scan if you will be adding any more kanji to your deck, or you'll have to add the SVGs to your media folder again.
 
 I have submitted a post to [http://www.japaneselevelup.com](Japanese Level Up) which will have more tips on using stroke order diagrams in an anki deck, and examples of these diagrams.  I expect it to be available to read within a few days.