feat: increase supported argument count from 15 to 32

Closes #77

Author: kylef

Examples/Sources/generator/main.swift

@@ -5,7 +5,7 @@ import PathKit
 let sourcePath = Path(#file) + ".."
 
 command(
-  Option("amount", default: 15, description: "The number of arguments to support.")
+  Option("amount", default: 32, description: "The number of arguments to support.")
 ) { amount in
   let template = try Template(path: sourcePath + "template.swift")