update avutil.dll builds

Author: gniezen

README.md

@@ -6,6 +6,8 @@ Use LZO for decompression on Node.js
 
 `lzo-decompress` is an [N-API](https://nodejs.org/api/n-api.html) wrapper around the LZO implementation of [FFMpeg's libavutil](https://github.com/FFmpeg/FFmpeg/tree/master/libavutil) library. It uses version 3 of N-API which is [only available](https://nodejs.org/api/n-api.html#n_api_n_api_version_matrix) on Node v10 and higher.
 
+This software uses code of [FFmpeg](http://ffmpeg.org) licensed under the [LGPLv3](https://www.gnu.org/licenses/lgpl.html) and its source can be downloaded [here](https://github.com/FFmpeg/FFmpeg/tree/master/libavutil).
+
 ## Usage
 
 ```
@@ -16,8 +18,8 @@ lzo.decompress(input, length);
 
 ## Building
 
-- yarn prebuild
-- yarn prebuild-ia32 (for 32-bit versions)
+- `yarn prebuild`
+- `yarn prebuild-ia32` (for 32-bit versions)
 
 ## Updating on Yarn/NPM