Specify file format explicitly

[devmotion]

This PR fixes https://github.com/JuliaStats/RDatasets.jl/issues/117 - and does not seem to break the tests. It specifies the file format explicitly when loading ".rda" files instead of relying on the automatic discovery in FileIO. This PR is an alternative to https://github.com/JuliaStats/RDatasets.jl/pull/118.

@timholy My guess is that FileIO 1.6 changed the query mechanism. It seems it prioritized the file ending in FileIO <= 1.5 but with FileIO 1.6 the file type is determined incorrectly as Gzip due to the magic bytes of compressed RData files.

[codecov-io]

Codecov Report

Merging #119 (47b34c2) into master (c2b17d0) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #119   +/-   ##
=======================================
  Coverage   84.00%   84.00%           
=======================================
  Files           4        4           
  Lines          25       25           
=======================================
  Hits           21       21           
  Misses          4        4           

Impacted Files	Coverage Δ
src/RDatasets.jl	100.00% <ø> (ø)
src/dataset.jl	90.90% <100.00%> (ø)

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[devmotion]

Bump 😃 What is the general opinion? Should this change be applied, even if FileIO already fixed the original issue?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 81.48%. Comparing base (b1a5959) to head (fc0eedb).

Files	Patch %	Lines
src/dataset.jl	66.66%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #119      +/-   ##
==========================================
- Coverage   83.33%   81.48%   -1.86%     
==========================================
  Files           3        4       +1     
  Lines          24       27       +3     
==========================================
+ Hits           20       22       +2     
- Misses          4        5       +1     

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