stackdriver_debugger: Changelog

Version Message
0.2.0 - Limit memory usage (#28)
- Limit time spent in debugger (#33)
- Detect and handle OPcache clearing (#35)
- Optionally limit stackframe depth for capturing variables (#39)
- Provide hash id for deduping arrays and strings (#41)
- Fix segfault for OSX (#42)
0.1.1 Fix missing snapshot w/ OPCache (#30)
0.1.0 First alpha release
0.0.2 Fix windows build configuration
0.0.1 First dev release