README: clarify support situation for FFmpeg <4

Pretty sure only 3.4.x works, and I have no intention of fixing things further
back.
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Zhiming Wang 2020-06-11 23:20:21 +08:00
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@ -9,7 +9,7 @@ Support for different FFmpeg versions are guarded by feature flags:
| 4.2.x | 58.54.100 | `ffmpeg42` (current default) |
| 4.1.x | 58.35.100 | `ffmpeg41` |
| 4.0.x | 58.18.100 | `ffmpeg4` |
| <4 | | none |
| 3.4.x | 57.107.100 | none |
See my [`metadata` project](https://github.com/zmwangx/metadata) for an example of targeting multiple versions of FFmpeg.