Update README.md

Author: ilg-ul

README.md

@@ -32,6 +32,14 @@ The **GNU MCU Eclipse ARM Embedded GCC** releases generally follow the official
 [GNU Arm Embedded Toolchain](https://developer.arm.com/open-source/gnu-toolchain/gnu-rm) 
 releases, maintained by ARM.
 
+### 7.3.1-1.1 (20180724)
+
+This release is functionally equivalent to **7-2018-q2-update** from June 27, 2018, 
+and is based on `gcc-arm-none-eabi-7-2018-q2-update-src.tar.bz2`
+([download](https://github.com/gnu-mcu-eclipse/arm-none-eabi-gcc/releases/tag/v7.3.1-1.1)).
+
+There should be no changes compared to the ARM release.
+
 ### 7.2.1-1.1 (20180401)
 
 This release is functionally equivalent to **7-2017-q4-major** from December 18, 2017,