transaction contains range are not serializable

[al8n]

Fix #10.

[codecov]

Codecov Report

Attention: Patch coverage is 89.21389% with 118 lines in your changes are missing coverage. Please review.

Project coverage is 82.94%. Comparing base (9f3400e) to head (1d8db96).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #11      +/-   ##
==========================================
+ Coverage   81.49%   82.94%   +1.45%     
==========================================
  Files          40       43       +3     
  Lines        3874     4749     +875     
==========================================
+ Hits         3157     3939     +782     
- Misses        717      810      +93     

Files	Coverage Δ
async-skipdb/src/optimistic/tests.rs	94.59% <100.00%> (ø)
async-skipdb/src/optimistic/write.rs	82.02% <100.00%> (ø)
async-skipdb/src/read.rs	100.00% <ø> (ø)
async-skipdb/src/serializable.rs	100.00% <100.00%> (ø)
async-skipdb/src/serializable/optimistic.rs	82.22% <100.00%> (ø)
async-skipdb/src/serializable/optimistic/tests.rs	95.40% <100.00%> (ø)
skipdb-core/src/iter.rs	82.53% <ø> (ø)
skipdb-core/src/range.rs	80.95% <ø> (ø)
skipdb/src/optimistic/write.rs	88.88% <100.00%> (ø)
skipdb/src/read.rs	100.00% <ø> (ø)
... and 11 more

... and 1 file with indirect coverage changes

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