Update Reexport compat to 1.0

[IanButterworth]

@staticfloat ping

[codecov]

Codecov Report

Merging #30 (1975783) into master (7797652) will decrease coverage by 1.50%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #30      +/-   ##
==========================================
- Coverage   70.50%   69.00%   -1.51%     
==========================================
  Files          45       42       -3     
  Lines        1197     1168      -29     
==========================================
- Hits          844      806      -38     
- Misses        353      362       +9     

Impacted Files	Coverage Δ
src/utils.jl	53.84% <0.00%> (-40.28%)	⬇️
src/ObjectFile.jl	100.00% <0.00%> (ø)
src/COFF/COFF.jl
src/MachO/MachO.jl
src/ELF/ELF.jl

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[giordano]

This is checking out the manifest, which fixes Reexport to 0.2, so we aren't actually testing the new version

[IanButterworth]

@staticfloat 1 tedious reapproval of CI runs please