misc: update dependencies

[Skallwar]

Not sure to understand the problem here

[codecov[bot]]

Codecov Report

Merging #209 (a335944) into master (d7aa100) will decrease coverage by 0.31%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #209      +/-   ##
==========================================
- Coverage   31.11%   30.81%   -0.31%     
==========================================
  Files          18       18              
  Lines        3278     3281       +3     
==========================================
- Hits         1020     1011       -9     
- Misses       2258     2270      +12     

Impacted Files	Coverage Δ
src/lib.rs	20.44% <0.00%> (-0.41%)	:arrow_down:
src/response.rs	27.07% <0.00%> (-0.12%)	:arrow_down:

[Skallwar]

Looks like an MSRV issue