allow extra root properties in configuration file (3cbcec0)
more lenient language and engine configuration field (f9eef3d)
support only string format for engine config field (838464e)
use appmap_dir and appmap_file instead of output config field (bcad7b7)
use the constant javascript string for language's config field (c28c273)
whitelist some external but expected root config properties (ddbb914)
BREAKING CHANGES
The output configuration field is no longer recognized.
It is no longer possible to provide a custom extension
for appmap files.
name-version object format for engine configuration
field is no longer supported
the agent will throw an error if the language
configuration field is anything else than 'javascript'
It is no longer possible to tell acorn to parse the
code to be instrumented as a particular ecmascript version. Instead, we
now always use the latest version. This should not cause problems
because ecmascript is backward-compatible.