支持 Null Safety & 升级到 0.3.0

[codecov[bot]]

Codecov Report

Merging #44 (06ca584) into master (785f4e9) will decrease coverage by 75.15%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           master      #44       +/-   ##
===========================================
- Coverage   91.19%   16.03%   -75.16%     
===========================================
  Files          27       27               
  Lines         636      636               
===========================================
- Hits          580      102      -478     
- Misses         56      534      +478     

Impacted Files	Coverage Δ
base/lib/src/storage/task/task.dart	0.00% <0.00%> (-100.00%)	:arrow_down:
base/lib/src/storage/methods/put/put_options.dart	0.00% <0.00%> (-100.00%)	:arrow_down:
base/lib/src/storage/methods/put/put_response.dart	0.00% <0.00%> (-100.00%)	:arrow_down:
...b/src/storage/methods/put/by_part/cache_mixin.dart	0.00% <0.00%> (-100.00%)	:arrow_down:
...c/storage/methods/put/by_part/init_parts_task.dart	0.00% <0.00%> (-100.00%)	:arrow_down:
...orage/methods/put/by_part/complete_parts_task.dart	0.00% <0.00%> (-100.00%)	:arrow_down:
...orage/methods/put/by_part/put_by_part_options.dart	0.00% <0.00%> (-100.00%)	:arrow_down:
...rage/methods/put/by_single/put_by_single_task.dart	0.00% <0.00%> (-100.00%)	:arrow_down:
...e/methods/put/by_single/put_by_single_options.dart	0.00% <0.00%> (-100.00%)	:arrow_down:
...rc/storage/methods/put/by_part/put_parts_task.dart	0.00% <0.00%> (-98.51%)	:arrow_down:
... and 13 more

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