0.1.3 Major performance update

2020-02-25: 0.1.3

Changed

• Removed unsafe implementations of Sync + Send because they are deduced by compiler
• Make some optimizations which reduce timings by 50% but increase memory usage in worst case on 30%
• Added benchmarks

Added trait Default to KeyedPriorityQueue

Release 0.1.1. Added Default trait implementation to KeyedPriorityQueue

Added Default trait implementation to KeyedPriorityQueue.
Also removed some data from Cargo.toml because it let to warnings from rustc.