Skip proptest tests in codecov (and edition 2018)

[codecov[bot]]

Codecov Report

Merging #55 into master will decrease coverage by 5.14%. The diff coverage is 42.10%.

@@            Coverage Diff             @@
##           master      #55      +/-   ##
==========================================
- Coverage   95.42%   90.28%   -5.15%     
==========================================
  Files          18       18              
  Lines        2315     2315              
==========================================
- Hits         2209     2090     -119     
- Misses        106      225     +119     

Impacted Files	Coverage Δ
src/encode/bytes.rs	95.50% <ø> (ø)
src/encode/diag.rs	91.73% <ø> (ø)
src/encode/hex.rs	80.37% <ø> (-4.02%)	:arrow_down:
src/parse/binary.rs	98.66% <ø> (-1.34%)	:arrow_down:
src/parse/diag.rs	96.38% <ø> (-1.21%)	:arrow_down:
src/parse/mod.rs	100.00% <ø> (ø)
tests/array.rs	100.00% <ø> (ø)
tests/bytes.rs	100.00% <ø> (ø)
tests/float.rs	100.00% <ø> (ø)
tests/integer.rs	100.00% <ø> (ø)
... and 11 more

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[Nemo157]

bors r+

[bors[bot]]

Build succeeded:

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