Set MSRV to 1.58 for now

[djc]

No description provided.

[codecov]

Codecov Report

Merging #134 (d965f10) into main (92306cb) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #134   +/-   ##
=======================================
  Coverage   78.95%   78.95%           
=======================================
  Files           7        7           
  Lines         689      689           
=======================================
  Hits          544      544           
  Misses        145      145           

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[djc]

@nyurik do you know what might be going on with the CI failure here?

[nyurik]

@djc the MSRV must be set to 1.58, not 1.56. That's the first version with inline format strings. See #125 (comment)