v0.4.0

• Fix #5: Throw std::logic_error on recursive process_event() invocation.
• Fix #14: Fix fsm.h include guard.
• Simplify build environment.

v0.3.0

• Fix #9: Improve documentation build process.
• Fix #11: Use conventional const notation.
• Fix #12: Use .h suffix for header files.
• Refactor/cleanup fsm implementation.
• Silence clang warnings.

v0.2.1

• Fix #10: Work around g++-6 "not a constant expression" errors.

v0.2.0

• Fix #4: Add docs to distribution.
• Fix #6: Add definitions for static constant members.

v0.1.0

• Initial release.