WIP: Update fallback strategies for converters

[prkumar]

Fixes #183, #180.

Changes proposed in this pull request:

Attention: @prkumar

[codecov]

Codecov Report

Merging #193 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master   #193    +/-   ##
======================================
  Coverage     100%   100%            
======================================
  Files          41     41            
  Lines        2322   2167   -155     
  Branches      173    171     -2     
======================================
- Hits         2322   2167   -155

Impacted Files	Coverage Δ
uplink/converters/standard.py	100% <100%> (ø)	⬆️
uplink/arguments.py	100% <100%> (ø)	⬆️
uplink/clients/io/asyncio_strategy.py	100% <0%> (ø)	⬆️
uplink/clients/io/execution.py	100% <0%> (ø)	⬆️
uplink/clients/__init__.py	100% <0%> (ø)	⬆️
uplink/ratelimit.py	100% <0%> (ø)	⬆️
uplink/clients/requests_.py	100% <0%> (ø)	⬆️
uplink/builder.py	100% <0%> (ø)	⬆️
uplink/converters/__init__.py	100% <0%> (ø)	⬆️
... and 15 more

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