Update README.md

Author: vshymanskyy

README.md

@@ -3,7 +3,7 @@
 
 Main repository: [**Wasm3 project**](https://github.com/wasm3/wasm3)  
 This library can be used with 
-[`Arduino`](https://www.arduinolibraries.info/libraries/Wasm3), 
+[`Arduino`](https://www.arduinolibraries.info/libraries/wasm3), 
 [`PlatformIO`](https://platformio.org/lib/show/6973/Wasm3) and 
 [`Particle`](https://build.particle.io/libs/Wasm3/latest/tab/example/Wasm_Blink.ino).