Update README around version compatibility matrix (#2293)

Summary:
Following the issue https://github.com/pytorch/text/issues/1662, add more clarification on LTS.
Also tidy up a bit by moving older versions in to details.

cc Nayef211

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<img width="794" alt="Screen Shot 2022-03-25 at 2 30 49 PM" src="https://user-images.githubusercontent.com/855818/160203327-acc5cbcb-ca86-43ee-b59f-48795b9e676c.png">

Pull Request resolved: https://github.com/pytorch/audio/pull/2293

Reviewed By: hwangjeff

Differential Revision: D35159211

Pulled By: mthrok

fbshipit-source-id: 18908c62440fc02773634c2700020fc407893dd3

README.md

@@ -31,10 +31,16 @@ Dependencies
 
 The following are the corresponding ``torchaudio`` versions and supported Python versions.
 
+| | ``torch``                | ``torchaudio``           | ``python``                      |
+| ----------- | ------------------------ | ------------------------ | ------------------------------- |
+| Development | ``master`` / ``nightly`` | ``main`` / ``nightly``   | ``>=3.7``, ``<=3.9``            |
+| Latest versioned release | ``1.11.0``               | ``0.11.0``               | ``>=3.7``, ``<=3.9``            |
+| LTS | ``1.8.2``               | ``0.8.2``               | ``>=3.6``, ``<=3.9``            |
+
+<details><summary>Previous versions</summary>
+
 | ``torch``                | ``torchaudio``           | ``python``                      |
 | ------------------------ | ------------------------ | ------------------------------- |
-| ``master`` / ``nightly`` | ``main`` / ``nightly``   | ``>=3.7``, ``<=3.9``            |
-| ``1.11.0``               | ``0.11.0``               | ``>=3.7``, ``<=3.9``            |
 | ``1.10.0``               | ``0.10.0``               | ``>=3.6``, ``<=3.9``            |
 | ``1.9.1``                | ``0.9.1``                | ``>=3.6``, ``<=3.9``            |
 | ``1.9.0``                | ``0.9.0``                | ``>=3.6``, ``<=3.9``            |
@@ -46,18 +52,21 @@ The following are the corresponding ``torchaudio`` versions and supported Python
 | ``1.5.0``                | ``0.5.0``                | ``>=3.5``, ``<=3.8``            |
 | ``1.4.0``                | ``0.4.0``                | ``==2.7``, ``>=3.5``, ``<=3.8`` |
 
+</details>
 
 Installation
 ------------
 
-### Binary Distributions (stable and nightly)
+### Binary Distributions
 
 `torchaudio` has binary distributions for PyPI (`pip`) and Anaconda (`conda`).
 
-Starting `0.10`, torchaudio has CPU-only and CUDA-enabled binary distributions, each of which requires a matching PyTorch version.
-
 Please refer to https://pytorch.org/get-started/locally/ for the details.
 
+**Note** Starting `0.10`, torchaudio has CPU-only and CUDA-enabled binary distributions, each of which requires a matching PyTorch version.
+
+**Note** <ins>LTS versions are distributed through a different channel than the other versioned releases. Please refer to the above page for details.</ins>
+
 ### From Source
 
 On non-Windows platforms, the build process builds libsox and codecs that torchaudio need to link to. It will fetch and build libmad, lame, flac, vorbis, opus, and libsox before building extension. This process requires `cmake` and `pkg-config`. libsox-based features can be disabled with `BUILD_SOX=0`.