Setup code coverage

[codecov-io]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@5bd22aa). Click here to learn what that means. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #52   +/-   ##
=========================================
  Coverage          ?   95.20%           
=========================================
  Files             ?       18           
  Lines             ?     2315           
  Branches          ?        0           
=========================================
  Hits              ?     2204           
  Misses            ?      111           
  Partials          ?        0           

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[Nemo157]

bors r+

[bors[bot]]

Build succeeded:

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