Bump version to 0.3.15

[Nemo157]

No description provided.

[Nemo157]

bors r+

[codecov-commenter]

Codecov Report

Base: 78.36% // Head: 78.36% // No change to project coverage 👍

Coverage data is based on head (886288e) compared to base (435258c).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           prīmum     #177   +/-   ##
=======================================
  Coverage   78.36%   78.36%           
=======================================
  Files          94       94           
  Lines        3069     3069           
=======================================
  Hits         2405     2405           
  Misses        664      664           

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[bors]

Build succeeded:

• cargo clippy
• cargo deny bans licenses sources
• cargo doc --cfg docsrs
• cargo fmt --check
• cargo hack check --all-targets --feature-powerset
• cargo hack check --feature-powerset
• cargo test
• cargo test --shallow-minimal-versions
• 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)