Update REQUIRE with WeakRefStrings & DataStreams upperbounds for release

[cjprybol]

No description provided.

[codecov]

Codecov Report

Merging #94 into master will decrease coverage by 18.9%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master      #94       +/-   ##
===========================================
- Coverage   95.81%   76.91%   -18.91%     
===========================================
  Files           5        5               
  Lines         598      745      +147     
===========================================
  Hits          573      573               
- Misses         25      172      +147

Impacted Files	Coverage Δ
src/CSV.jl	64.7% <0%> (-35.3%)	⬇️
src/Sink.jl	67.69% <0%> (-27.96%)	⬇️
src/Source.jl	76.87% <0%> (-23.13%)	⬇️
src/io.jl	77.12% <0%> (-22.04%)	⬇️
src/parsefields.jl	79.87% <0%> (-12.49%)	⬇️

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[cjprybol]

holding off on this until JuliaLang/METADATA.jl#10915. If the upper bounds are added as shown in this diff then this won't be necessary. In that case, remember to close JuliaLang/METADATA.jl#10923 too rather than retagging a v0.1.5 release

[nalimilan]

Adding the bounds here to match those in METADATA.jl would be a good idea. We can easily remove them once the package will support the newer versions.