Require safe ^1.2

[shish]

1.0 and 1.1 use resource as a literal type hint, which is interpreted as a class name, which results in error reports

(I'm not sure why anybody would be using safe v1.0 or v1.1, but our test suite checks with --prefer-lowest, and I'm not sure why that didn't catch this issue earlier)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.74%. Comparing base (489a040) to head (b56a54a).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #51   +/-   ##
=========================================
  Coverage     57.74%   57.74%           
  Complexity       53       53           
=========================================
  Files             9        9           
  Lines           142      142           
=========================================
  Hits             82       82           
  Misses           60       60           

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