v0.9.0

• Added L2CAP support (#117)
• Added BLEDevice::get_addr
• Enforce BLEClient creation via BLEDevice instance (#146)
• Added BLECharacteristic::notify_with
• Fix cpfd config attribute (#153)
• Use zerocopy package (#155)
• Merge BLE2904 into Cpfd (#156)
• Upgraded to esp-idf-svc 0.50.1 (#159)