fix: Fix minimum required version of Packager

The change "Restrict WebM formats to DASH protocol (#80)" uses a
Packager feature that was introduced in Packager v2.5, but failed to
update the minimum required version in streamer/controller_node.py.

This change updates the minimum version to v2.5.

Issue #18

Change-Id: I894f72d979d6f3f5d88170a5ce62c113a5635f76

CHANGELOG.md

@@ -6,7 +6,7 @@
  - Add `--skip_deps_check` to bypass version checks on dependencies
  - Increase preserved segments outside of the availability window, improving HLS
    playback in Shaka Player
- - Require Shaka Packager v2.4+
+ - Require Shaka Packager v2.5+
  - Add AV1 support
    (https://github.com/google/shaka-streamer/issues/10)
  - Drop `raw_images` input type

streamer/controller_node.py

@@ -92,7 +92,7 @@ def start(self, output_location: str,
       _check_version('ffprobe', ['ffprobe', '-version'], (4, 1))
 
       # Check that Shaka Packager version is 2.4.2 or above.
-      _check_version('Shaka Packager', ['packager', '-version'], (2, 4, 2))
+      _check_version('Shaka Packager', ['packager', '-version'], (2, 5, 1))
 
       if bucket_url:
         # Check that the Google Cloud SDK is at least v212, which introduced