fix: allow migration for versions greater than 0.3.2

[satra]

Allow migrating from versions greater 0.3.1

[codecov]

Codecov Report

Merging #40 (3b97841) into master (c8c0888) will decrease coverage by 0.09%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master      #40      +/-   ##
==========================================
- Coverage   95.79%   95.70%   -0.10%     
==========================================
  Files          11       11              
  Lines         975      977       +2     
==========================================
+ Hits          934      935       +1     
- Misses         41       42       +1     

Flag	Coverage Δ
unittests	95.70% <75.00%> (-0.10%)	⬇️

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Impacted Files	Coverage Δ
dandischema/metadata.py	96.55% <66.66%> (-0.55%)	⬇️
dandischema/consts.py	100.00% <100.00%> (ø)

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[dchiquito]

It seems like we'd only like to run most of that block of code when migrating from < 0.3.2. What about adding this instead:

elif version2tuple(schema_version) < version2tuple(DANDI_SCHEMA_VERSION):
    obj["schemaVersion"] = to_version