UPdate README.md

Author: n-eq

README.md

@@ -14,7 +14,7 @@ _It is based on [the work](https://github.com/dancek/pcd8544-hal/) by Hannu Hart
 
 ## Model support
 
-Any microcontroller HAL with embedded-hal support should work with this driver
+Any microcontroller HAL with embedded-hal support should work with this driver.
 
 ## Usage
 Add this line to your `Cargo.toml`'s `[dependencies]` section: