Bump version in README.

Author: colinc86

README.md

@@ -47,7 +47,7 @@ It won't
 Add the dependency to your package manifest file.
 
 ```swift
-.package(url: "https://github.com/colinc86/LaTeXSwiftUI", from: "1.2.0")
+.package(url: "https://github.com/colinc86/LaTeXSwiftUI", from: "1.2.1")
 ```
 
 ## ⌨️ Usage