chore: update version to 8.0.0 and document changes

Author: bajankristof

CHANGELOG

@@ -1,3 +1,14 @@
+== 8.0.0 2025-06-27
+
+Improvements:
+* Added support for retries in the `FFMPEG::Transcoder` class. This allows for more robust command
+  argument composing and thus more stable outputs.
+
+Breaking Changes:
+* The `FFMPEG::Status::ExitError` class has been renamed to `FFMPEG::ExitError`.
+* The `FFMPEG::ExitError` class now holds a reference to the `StringIO` output of the FFmpeg command
+  (before it contained the `String` representation).
+
 == 7.1.4 2025-06-23
 
 Fixes:

lib/ffmpeg/version.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module FFMPEG
-  VERSION = '7.1.4'
+  VERSION = '8.0.0'
 end