v0.4.0

What's Changed

• Add policy feature flags by @TKorr in #15
• Add tiny lfu to roadmap by @TKorr in #17
• Add CAR (Clock with Adaptive Replacement) policy documentation and im… by @TKorr in #16
• Update readme by @TKorr in #18

Full Changelog: v0.3.0...v0.4.0