Update documentation to correct C++ version: C++ 17

Signed-off-by: Teresa Charlin <teresa.charlinreyes@arm.com>
Signed-off-by: Tracy Narine <tracy.narine@arm.com>
Change-Id: I3aab361023d6330dd1c28d30dee4a81999ad1a53
diff --git a/README.md b/README.md
index 9a8cd9b..0f1562b 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@
 utilizes the [Ethos-N NPU Driver](https://github.com/ARM-software/ethos-n-driver-stack). For Arm Cortex-M acceleration,
 please see [CMSIS-NN](https://github.com/ARM-software/CMSIS_5).
 
-Arm NN is written using portable **C++14** and built using [CMake](https://cmake.org/) - enabling builds for a wide
+Arm NN is written using portable **C++17** and built using [CMake](https://cmake.org/) - enabling builds for a wide
 variety of target platforms, from a wide variety of host environments. **Python** developers can interface with Arm NN
 through the use of our **Arm NN TF Lite Delegate**.