Release 0.3.2

[avital]

1. In the 0.3.1 release we (I) forgot to update the README for the new version
2. In the 0.3.1 release, import flax led to a flax.nn deprecation warning. In order to eliminate this, we now only raise a deprecation warning when instantiating a flax.nn.Module instance, not simply when importing flax.nn.
3. Un-revert accidental changes to CHANGELOG that erased the 0.3.1 changes (f63d210)

[codecov-io]

Codecov Report

Merging #1055 (f8fcbbe) into master (b35b60f) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1055      +/-   ##
==========================================
- Coverage   82.02%   82.01%   -0.01%     
==========================================
  Files          63       63              
  Lines        5112     5110       -2     
==========================================
- Hits         4193     4191       -2     
  Misses        919      919              

Impacted Files	Coverage Δ
flax/__init__.py	100.00% <ø> (ø)
flax/nn/base.py	92.46% <ø> (ø)
flax/optim/base.py	82.25% <100.00%> (-0.10%)	⬇️
flax/version.py	100.00% <100.00%> (ø)

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[jheek]

Wouldn't it be easier to move the deprecation warning to some piece of the old Module code that is always triggered when you actually use it? Like the Module constructor? Other codebases might also important the old nn api for simple instance checks and such or other backward compatibility tasks.

[avital]

Good point. That's much simpler indeed. /cc @levskaya.