Update dependencies

[Satelles157]

Updating chrono v0.4.17 -> v0.4.19 Updating libc v0.2.77 -> v0.2.78 Updating proc-macro2 v1.0.22 -> v1.0.24 Updating syn v1.0.41 -> v1.0.42

[Nemo157]

bors r+

[bors[bot]]

Build succeeded:

• cargo build --target wasm32-unknown-unknown
• cargo build -z minimal-versions
• cargo clippy
• cargo fmt --check
• cargo test
• cargo test (stable, i686-pc-windows-msvc, windows-latest)
• cargo test (stable, i686-unknown-linux-gnu, ubuntu-latest)
• cargo test (stable, x86_64-apple-darwin, macos-latest)
• cargo test (stable, x86_64-pc-windows-msvc, windows-latest)
• cargo test (stable, x86_64-unknown-linux-gnu, ubuntu-latest)

[codecov[bot]]

Codecov Report

Merging #100 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #100   +/-   ##
=======================================
  Coverage   88.13%   88.13%           
=======================================
  Files          18       18           
  Lines        1846     1846           
=======================================
  Hits         1627     1627           
  Misses        219      219           

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