v0.1.0: Performance improvements + binary bundle

This release includes:

• Indexing performance improvements, some specifically for high core count machines (#85). For example, indexing the CMake repo (~1000 jobs) is about 2x as fast on a 60 core machine compared to before, contributed by @varungandhi-src.
• Support for customizing the level of concurrency via the --jobs flag, contributed by @ericremoreynolds (#81).
• A bundled package, which includes the lsif-clang binary and used dynamic libraries, contributed by @jlisee (#83). For Ubuntu 18.04+ users, it should be possible to decompress the attached tarball and directly use lsif-clang, without building it from source or using Docker.
• Stack traces should be present for crashes, including inside individual indexing jobs as well as the outer driver job (#80), contributed by @varungandhi-src.