Enable use of readabs by users on networks where curl is blocked

[MattCowgill]

No description provided.

[codecov]

Codecov Report

Merging #141 (d7a5e86) into master (0a1ce7c) will decrease coverage by 4.06%.
The diff coverage is 62.16%.

@@            Coverage Diff             @@
##           master     #141      +/-   ##
==========================================
- Coverage   90.74%   86.68%   -4.07%     
==========================================
  Files          27       27              
  Lines         962     1014      +52     
==========================================
+ Hits          873      879       +6     
- Misses         89      135      +46     

Impacted Files	Coverage Δ
R/extract_abs_sheets.R	84.21% <ø> (-0.79%)	⬇️
R/check_abs_connection.R	36.00% <27.27%> (-14.00%)	⬇️
R/read_payrolls.R	62.80% <28.12%> (-30.95%)	⬇️
R/get_abs_xml_metadata.R	91.66% <84.21%> (+1.38%)	⬆️
R/download_abs.R	100.00% <100.00%> (ø)
R/download_data_cube.r	89.47% <100.00%> (-4.65%)	⬇️
R/get_xml_df.R	94.11% <100.00%> (+4.11%)	⬆️
R/scrape_abs_catalogues.r	100.00% <100.00%> (ø)
R/show_available_files.r	84.09% <100.00%> (+2.03%)	⬆️

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