prepare 3.0.0 release

[LaunchDarklyCI]

[3.0.0] - 2019-12-13

Added:

• Configuration property eventCapacity: the maximum number of analytics events (not counting evaluation counters) that can be held at once, to prevent the SDK from consuming unexpected amounts of memory in case an application generates events unusually rapidly. In JavaScript code this would not normally be an issue, since the SDK flushes events every two seconds by default, but you may wish to increase this value if you will intentionally be generating a high volume of custom or identify events. The default value is 100.

Changed:

• (Breaking change) The extraDefaults parameter to the internal common initialize method is now extraOptionDefs and has a different format, allowing for more flexible validation.
• The SDK now logs a warning if any configuration property has an inappropriate type, such as baseUri:3 or sendEvents:"no". For boolean properties, the SDK will still interpret the value in terms of truthiness, which was the previous behavior. For all other types, since there's no such commonly accepted way to coerce the type, it will fall back to the default setting for that property; previously, the behavior was undefined but most such mistakes would have caused the SDK to throw an exception at some later point.
• Removed or updated some development dependencies that were causing vulnerability warnings.

Deprecated:

• The samplingInterval configuration property was deprecated in the code in the previous minor version release, and in the changelog, but the deprecation notice was accidentally omitted from the documentation comments. It is hereby deprecated again.