Update mainline to reflect changes after the release. (#563)

* Update README.md

* Update History.txt

* Update version number macros

* Update manifest.yml

History.txt

@@ -1,3 +1,8 @@
+Changes between V3.0.0 and V3.1.0 releases:
+        + Fixed a bug in the Connect function where multiple SYN and RST packet combinations can
+          lead to orphaned sockets.
+        + Added network interface support for NetifSlirp.
+
 Changes between V3.0.0 and V2.4.0 releases:
         + Split the source files according to the function the code performs.
           This makes the code modular making test coverage easier.

README.md

@@ -8,7 +8,7 @@ The easiest way to use FreeRTOS-Plus-TCP is to start with the pre-configured dem
 
 Additionally, for FreeRTOS-Plus-TCP source code organization refer to the [Documentation](http://www.FreeRTOS.org/FreeRTOS-Plus/FreeRTOS_Plus_TCP/TCP_Networking_Tutorial.html), and [API Reference](https://freertos.org/FreeRTOS-Plus/FreeRTOS_Plus_TCP/FreeRTOS_TCP_API_Functions.html).
 
-FreeRTOS-Plus-TCP V2.3.2-LTS-Patch-2 [source code](https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/tree/V2.3.2-LTS-Patch-2)(.c .h) is part of the [FreeRTOS 202012.04 LTS](https://github.com/FreeRTOS/FreeRTOS-LTS/tree/202012.04-LTS) release.
+**FreeRTOS-Plus-TCP V3.1.0 [source code](https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/tree/V3.1.0)(.c .h) is part of the [FreeRTOS 202210.00 LTS](https://github.com/FreeRTOS/FreeRTOS-LTS/tree/202210.00-LTS) release.**
 
 ### Getting help
 If you have any questions or need assistance troubleshooting your FreeRTOS project, we have an active community that can help on the [FreeRTOS Community Support Forum](https://forums.freertos.org). Please also refer to [FAQ](http://www.freertos.org/FAQHelp.html) for frequently asked questions.

manifest.yml

@@ -1,5 +1,5 @@
 name : "FreeRTOS-Plus-TCP"
-version: "V3.0.0"
+version: "V3.1.0"
 description: "Thread safe FreeRTOS TCP/IP stack working on top of the FreeRTOS-Kernel to implement the TCP/IP protocol. Suitable for microcontrollers."
 license: "MIT"
 dependencies:

source/include/FreeRTOS_IP.h

@@ -44,9 +44,9 @@
 
 /* Constants defining the current version of the FreeRTOS+TCP
  * network stack. */
-#define ipFR_TCP_VERSION_NUMBER    "V3.0.999"
+#define ipFR_TCP_VERSION_NUMBER    "V3.1.999"
 #define ipFR_TCP_VERSION_MAJOR     3
-#define ipFR_TCP_VERSION_MINOR     0
+#define ipFR_TCP_VERSION_MINOR     1
 /* Development builds are always version 999. */
 #define ipFR_TCP_VERSION_BUILD     999