changelog entry for 0.7.0

[will-moore]

Corresponding to https://github.com/ome/ome-zarr-py/milestone/1

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.25 🎉

Comparison is base (9540832) 84.54% compared to head (c9006bd) 84.79%.

❗ Current head c9006bd differs from pull request most recent head 6c547aa. Consider uploading reports for the commit 6c547aa to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #267      +/-   ##
==========================================
+ Coverage   84.54%   84.79%   +0.25%     
==========================================
  Files          13       13              
  Lines        1475     1473       -2     
==========================================
+ Hits         1247     1249       +2     
+ Misses        228      224       -4     

see 9 files with indirect coverage changes

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[will-moore]

#257 was already in the changelog