0.2.0 add clone and copy derives, #26
      faster fast_graph building
      faster queries (stall on demand optimization), #18
      fix serious performance regression for Rust >=1.45, #21
      remove rand and bincode dependencies, #17
      allow storing the graph for 32bit systems on a 64bit system, #14
      WebAssembly compatibility, #11
      deterministic fast_graph building, #10
      license change to dual MIT/Apache 2.0, #4
0.1.1 adds travis and meta information to Cargo.toml
0.1.0 initial version