docs: Updated for 4.20.14601

* No new dictionaries added in this version.
* Base64-encoded images now work perfectly in both dictionary views.
* URL schemes other than dict:/// don't cause the in-book dictionary
  view to segfault anymore.
* Images referenced with dict:/// URLs still blank the webview in
  both views.

Also see #1.

cmd/dictutil/install.go

@@ -19,7 +19,7 @@ import (
 )
 
 var (
-	builtinUpdated = "4.19.14123"
+	builtinUpdated = "4.20.14601"
 	builtinDict    = map[string]string{
 		"de":        "Deutsch",
 		"de-en":     "Deutsch - English",

docs/dicthtml/format.md

@@ -12,7 +12,7 @@ This document describes [version 2](./v1v2) of Kobo dictionaries. Japanese dicti
 
 Kobo dictzips are standard ZIP files. In general, they are named `dicthtml-LOCALE.zip` where **LOCALE** is the ISO-639-1 language code (although custom locale codes can be used if added to ExtraLocales in the Kobo config file). In addition, a dictzip may be named `dicthtml-LOCALE-LOCALE.zip` for translation dictionaries. Some official dictionaries have slightly different locale codes (e.g. `jaxxdjs`), but these are exceptions.
 
-As of firmware 4.19.14123, the official dictionaries are hosted on `https://kbdownload1-a.akamaihd.net/ereader/dictionaries/v2/dicthtml*.zip`, and support the following locales:
+As of firmware 4.20.14601, the official dictionaries are hosted on `https://kbdownload1-a.akamaihd.net/ereader/dictionaries/v2/dicthtml*.zip`, and support the following locales:
 
 | Locale     | Language |
 | ---        | --- |
@@ -132,6 +132,8 @@ If you have control over the target device, you can also use `file:///...` URLs
 
 As of firmware 4.19.14123, all of these methods are too buggy (due to bugs in libnickel) to be usable. The only one which works is base64-encoded images in the full-screen dictionary view (i.e. not the in-book dictionary). The `dict:///` URLs cause the webview to appear blank, and the base64-encoded and file URLs cause nickel to segfault in the in-book dictionary view. See [#1](https://github.com/geek1011/dictutil/issues/1) for more details.
 
+Starting in firmware 4.20.14601, the base64 method works perfectly in both views (yay!). Other URLs don't segfault the in-book dictionary view anymore, and `dict:///` URLs still blank the webview.
+
 ## Example
 
 This is an example dictdir using most of the things mentioned above.