Allow string return type, and URL-encode param (#38)

WoofWare.Myriad.Plugins/AstHelper.fs

@@ -105,6 +105,17 @@ module internal SynTypePatterns =
             | _ -> None
         | _ -> None
 
+    let (|String|_|) (fieldType : SynType) : unit option =
+        match fieldType with
+        | SynType.LongIdent ident ->
+            match ident.LongIdent with
+            | [ i ] ->
+                [ "string" ]
+                |> List.tryFind (fun s -> s = i.idText)
+                |> Option.map ignore<string>
+            | _ -> None
+        | _ -> None
+
     let (|NumberType|_|) (fieldType : SynType) =
         match fieldType with
         | SynType.LongIdent ident ->