address some 'nursery' lints

[danieleades]

No description provided.

[codecov]

Codecov Report

Merging #46 (913d0ac) into main (713cc91) will not change coverage.
The diff coverage is 0.00%.

@@          Coverage Diff          @@
##            main     #46   +/-   ##
=====================================
  Coverage   8.73%   8.73%           
=====================================
  Files         18      18           
  Lines        229     229           
=====================================
  Hits          20      20           
  Misses       209     209           

Impacted Files	Coverage Δ
src/client.rs	0.00% <ø> (ø)
src/client/inner/refreshable.rs	0.00% <0.00%> (ø)
src/endpoints.rs	0.00% <ø> (ø)
src/endpoints/auth.rs	0.00% <0.00%> (ø)
src/endpoints/balance.rs	0.00% <0.00%> (ø)
src/endpoints/feed_items.rs	0.00% <0.00%> (ø)
src/endpoints/pots.rs	100.00% <ø> (ø)
src/endpoints/pots/list.rs	0.00% <0.00%> (ø)
src/endpoints/transactions/get.rs	0.00% <0.00%> (ø)
src/endpoints/transactions/list.rs	0.00% <0.00%> (ø)

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