update readme (#312)

README.md

@@ -146,7 +146,7 @@ If you want to extract multiple images from your video, you can use the followin
 ```php
 $video
     ->filters()
-    ->extractMultipleFrames(FFMpeg\Filters\Video\ExtractMultipleFramesFilter::FRAMERATE_EVERY_10SEC, . '/path/to/destination/folder/')
+    ->extractMultipleFrames(FFMpeg\Filters\Video\ExtractMultipleFramesFilter::FRAMERATE_EVERY_10SEC, '/path/to/destination/folder/')
     ->synchronize();
 
 $video
@@ -436,11 +436,11 @@ your files MUST have video and audio streams.
 In both cases, you will have to provide a list of files in a TXT file.
 The TXT file will one path per line. Here is an example:
 
-`txt
+```txt
 file './concat-1.mp4'
 file 'concat-2.mp4'
 #file 'concat-3.mp4'
-`
+```
 
 In this example, the third file will be ignored.
 Please refer to the [documentation](https://trac.ffmpeg.org/wiki/Concatenate) for more details.
@@ -601,7 +601,7 @@ $app->register(new FFMpeg\FFMpegServiceProvider(), array(
 
 ## API Browser
 
-Browse the [API](http://readthedocs.org/docs/ffmpeg-php/en/latest/_static/API/)
+Browse the [API](https://ffmpeg-php.readthedocs.io/en/latest/_static/API/)
 
 ## License