v3.1.1

Minor code improvements

v3.1.0

• Added session events: newSession, endSession;
• Added the session id argument to the PSK callback;
• Provided examples for session events.

v3.0.0

• N-API migration (from a fork);
• DTLS client removed, use this.

v2.5.0

• Node.js 12 support (including changes from node-mbed-dtls-modified and AI)
• Moved mbedtls to submodules
• Fixed mbedtls package to version 2.27.0
• Updated vulnerable packages to latest compatible versions
• Updated examples
• Updated README