Bumping install version in README

Author: mobrien-ghost

README.md

@@ -336,7 +336,7 @@ Currently, SyntaxSparrow supports Swift Package Manager (SPM).
 To add SyntaxSparrow to your project, add the following line to your dependencies in your Package.swift file:
 
 ```swift
-.package(url: "https://github.com/CheekyGhost-Labs/SyntaxSparrow", from: "4.2.0")
+.package(url: "https://github.com/CheekyGhost-Labs/SyntaxSparrow", from: "4.2.1")
 ```
 
 Then, add SyntaxSparrow as a dependency for your target: