V0.3.0

[DevQps]

Description

This commit fixes a few things:

• It includes the README examples in the documentation tests.
• It fixes broken code that constructed malformed URLs.
• Generates error messages if listings for the future are requested.
• Generates error messages if listings for "today" are being requested for RIPE and LACNIC (they do not provide this).
• Refactored the download method in async.

Fixes #4 - ARIN restructured the FTP such that extended listings prior to this are available.

[codecov]

Codecov Report

Merging #10 (05a326c) into master (50c7e88) will increase coverage by 3.24%.
The diff coverage is 78.78%.

@@            Coverage Diff             @@
##           master      #10      +/-   ##
==========================================
+ Coverage   88.99%   92.23%   +3.24%     
==========================================
  Files           3        3              
  Lines         109      103       -6     
==========================================
- Hits           97       95       -2     
+ Misses         12        8       -4     

Impacted Files	Coverage Δ
src/lib.rs	97.77% <ø> (-2.23%)	⬇️
src/download.rs	85.71% <77.41%> (+8.35%)	⬆️
tests/readme.rs	100.00% <100.00%> (ø)

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