Upgrade edition 2021, rust nightly-2021-11-07

[zjb0807]

Closes: #649

[codecov-commenter]

Codecov Report

Merging #650 (e190bea) into master (d69f226) will decrease coverage by 0.09%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #650      +/-   ##
==========================================
- Coverage   76.02%   75.93%   -0.10%     
==========================================
  Files          78       78              
  Lines        6557     6549       -8     
==========================================
- Hits         4985     4973      -12     
- Misses       1572     1576       +4     

Impacted Files	Coverage Δ
bencher/src/build_wasm/prerequisites.rs	0.00% <ø> (ø)
bencher/src/build_wasm/wasm_project.rs	0.00% <0.00%> (ø)
xcm-support/src/currency_adapter.rs	66.66% <0.00%> (-14.29%)	⬇️
gradually-update/src/tests.rs	97.19% <0.00%> (-2.81%)	⬇️
xtokens/src/mock/mod.rs	86.04% <0.00%> (-2.33%)	⬇️
xtokens/src/lib.rs	69.50% <0.00%> (-0.71%)	⬇️
vesting/src/tests.rs	99.34% <0.00%> (-0.66%)	⬇️
currencies/src/lib.rs	53.48% <0.00%> (-0.47%)	⬇️
tokens/src/lib.rs	85.68% <0.00%> (-0.35%)	⬇️
xtokens/src/tests.rs	100.00% <0.00%> (ø)
... and 6 more

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