Notes
- Removed client support of the RC4 stream cipher for communicating with the New Relic servers. - The RC4 cipher is considered unsafe and is generally being deprecated. 
- Fix for logging version number in Express instrumentation. Thanks @tregagnon. - When an unsupported version of Express is detected, we log a message that contains the Express version number. The version is a string and was being logged as a number, resulting in NaN in the log message. 
- Agent is now more safe when recording memory stats. - Previously, the agent would crash the process as it was gathering memory usage information (i.e. when process.memoryUsage threw an error). This defect is now guarded against with a try-catch.