add in a raw flag in the command to json (#555)

* add in the method to_string_raw

* add in a raw flag to json

* add in a test

src/tests.rs

@@ -1324,3 +1324,11 @@ fn cjk_in_substrings() -> TestResult {
         "title-page.md",
     )
 }
+
+#[test]
+fn to_json_raw_flag() -> TestResult {
+    run_test(
+        "[[a b]; [jim susie] [3 4]] | to json -r",
+        r#"[{"a":"jim","b":"susie"},{"a":3,"b":4}]"#,
+    )
+}