V1.18.2.r2

### Improvements:
- Added API `do_handshake` for performing handshake operation for ssl/tls non- blocking socket connections
- Added Timeout option for ssl/tls handshake operation
- Amended ESP-IDF Error Codes to Micropython QSTR
- Updated sqnsupgrade script to v1.2.3

### Bug Fix
- Fixed crash caused by UART I/O APIs called after UART.deinit

Author: iwahdan88

esp32/pycom_version.h

@@ -10,7 +10,7 @@
 #ifndef VERSION_H_
 #define VERSION_H_
 
-#define SW_VERSION_NUMBER                              "1.18.2.r1"
+#define SW_VERSION_NUMBER                              "1.18.2.r2"
 
 #define LORAWAN_VERSION_NUMBER                         "1.0.2"