Fix a typo

README.md

@@ -16,7 +16,7 @@ Ground is an interpreter which processes and interprets Ground instructions. It
 Clone the repo and compile with your favourite C++ compiler:
 
 ```
-  g++ src/main.cpp -std=C++17 -O3 -o ground
+  g++ src/main.cpp -std=c++17 -O3 -o ground
 ```
 
 (You can omit the -std flag on systems which default to the latest standard, and the -O3 flag if you're fine with a slightly slower interpreter.)