docs: Fix simple typo, acepted -> accepted (#58)

There is a small typo in README.md.

Should read `accepted` rather than `acepted`.

README.md

@@ -74,7 +74,7 @@ All the display functions take an optional `refresh` argument that when set to `
 Default Format
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-The `format()` function can be invoked without arguments, in which case a default format of ISO8601 defined by the moment.js library is used. If you want to set a different default, you can set the `MOMENT_DEFAULT_FORMAT` variable in the Flask configuration. Consult the [moment.js format documentation](http://momentjs.com/docs/#/displaying/format/) for a list of acepted tokens.
+The `format()` function can be invoked without arguments, in which case a default format of ISO8601 defined by the moment.js library is used. If you want to set a different default, you can set the `MOMENT_DEFAULT_FORMAT` variable in the Flask configuration. Consult the [moment.js format documentation](http://momentjs.com/docs/#/displaying/format/) for a list of accepted tokens.
 
 Internationalization
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