added utils read.csv workaround for data download failing on windows

[seabbs]

Fixes for transient download issue on windows. Added second attempt at downloading data using utils::read_csv see issue #18

[codecov]

Codecov Report

Merging #19 into master will decrease coverage by 0.11%.
The diff coverage is 94.44%.

@@            Coverage Diff            @@
##           master     #19      +/-   ##
=========================================
- Coverage   95.81%   95.7%   -0.12%     
=========================================
  Files           8       8              
  Lines         311     326      +15     
=========================================
+ Hits          298     312      +14     
- Misses         13      14       +1

Impacted Files	Coverage Δ
R/get_tb_burden.R	100% <100%> (ø)	⬆️
R/get_data_dict.R	100% <100%> (ø)	⬆️
R/get_data.R	95.74% <92.3%> (-1.4%)	⬇️

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[seabbs]

Added more tests for work around and checking data is in the same format

[seabbs]

Updated documentation to reflect new testing arguements