Add compat note re File/Stream

[timholy]

Suggested in
JuliaStats/RDatasets.jl#119 (comment)

[timholy]

CC @devmotion

[codecov]

Codecov Report

Merging #309 (125a3fb) into master (8778bea) will decrease coverage by 2.35%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #309      +/-   ##
==========================================
- Coverage   89.40%   87.05%   -2.36%     
==========================================
  Files          10       10              
  Lines         623      556      -67     
==========================================
- Hits          557      484      -73     
- Misses         66       72       +6     

Impacted Files	Coverage Δ
src/types.jl	87.23% <ø> (-1.01%)	⬇️
src/mimesave.jl	64.70% <0.00%> (-13.08%)	⬇️
src/deprecated.jl	40.90% <0.00%> (-11.27%)	⬇️
src/registry_setup.jl	94.84% <0.00%> (-2.46%)	⬇️
src/query.jl	94.54% <0.00%> (-1.36%)	⬇️
src/error_handling.jl	78.94% <0.00%> (-1.06%)	⬇️
src/registry.jl	86.76% <0.00%> (-1.00%)	⬇️
src/loadsave.jl	98.52% <0.00%> (-0.21%)	⬇️
src/FileIO.jl	100.00% <0.00%> (ø)
... and 1 more

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[devmotion]

Thanks, looks good! Hopefully it helps others to avoid the mistake I made 🙂

[timholy]

It's not a mistake if it's not documented...