Merge pull request #518 from AnotherButler/patch-2

Update version number in README.md

Author: screamerbg

README.md

@@ -294,7 +294,7 @@ Edit `mbed_settings.py` to set your toolchain:
 
 * To use the [ARM Compiler toolchain](https://developer.arm.com/products/software-development-tools/compilers/arm-compiler-5/downloads), set `ARM_PATH` to the *base* directory of your ARM Compiler installation (example: C:\Program Files\ARM\armcc5.06). The recommended version of the ARM Compiler toolchain is 5.06.
 * To use the [GNU ARM Embedded toolchain (GCC) version 6](https://developer.arm.com/open-source/gnu-toolchain/gnu-rm/downloads), set `GCC_ARM_PATH` to the *binary* directory of your GCC ARM installation (example: C:\Program Files\GNU Tools ARM Embedded\6 2017q2\bin). Use version 6 of GCC ARM Embedded; version 5.0 or any older version might be incompatible with the tools.
-* To use the [IAR EWARM toolchain](https://www.iar.com/iar-embedded-workbench/#!?architecture=ARM), set `IAR_PATH` to the *base* directory of your IAR installation (example: C:\Program Files (x86)\IAR Systems\Embedded Workbench 7.5\arm). Use version 7.80.x of the IAR EWARM; newer (or older) versions might be incompatible with the tools.
+* To use the [IAR EWARM toolchain](https://www.iar.com/iar-embedded-workbench/#!?architecture=ARM), set `IAR_PATH` to the *base* directory of your IAR installation (example: C:\Program Files (x86)\IAR Systems\Embedded Workbench 7.5\arm). Use versions 7.70 to 7.80.x of the IAR EWARM; newer (or older) versions might be incompatible with the tools.
 
 Because `mbed_settings.py` contains local settings (possibly relevant only to a single OS on a single machine), you should not check it into version control.