README: Fix typo, add a TODO to fix parser/exporter type safety.

README.md

@@ -17,12 +17,12 @@ git clone git@github.com:yifan-gu/blueNote.git && go build
 
 #### Convert notes to org-roam files
 ```
-./blueNote convert -i kindlehtml -o org-roam examples/kindle_html_single_book_example.html ./
+./blueNote convert -i kindle-html -o org-roam examples/kindle_html_single_book_example.html ./
 ```
 
 #### Add `-s` if the book is a collection of multiple books
 ```
-./blueNote convert -i kindlehtml -o org-roam -s examples/kindle_html_collection_example.html ./
+./blueNote convert -i kindle-html -o org-roam -s examples/kindle_html_collection_example.html ./
 ```
 
 #### Browse and edit the notes with tags
@@ -63,6 +63,7 @@ Parser/Exporter:
 - [x] MongoDB exporter
 - [x] JSON parser
 - [ ] One click export from Kindle app
+- [ ] Change parser/exporter type from string to safe type
 
 Server Backend:
 - [x] Database storage