Added suport for error correction level to QR codes

docs/swagger/paths/{shortCode}_qr-code.json

@@ -35,10 +35,7 @@
                 "required": false,
                 "schema": {
                     "type": "string",
-                    "enum": [
-                        "png",
-                        "svg"
-                    ]
+                    "enum": ["png", "svg"]
                 }
             },
             {
@@ -51,6 +48,16 @@
                     "minimum": 0,
                     "default": 0
                 }
+            },
+            {
+                "name": "errorCorrection",
+                "in": "query",
+                "description": "The error correction level to apply to the the QR code: **[L]**ow, **[M]**edium, **[Q]**uartile or **[H]**igh. See [docs](https://www.qrcode.com/en/about/error_correction.html).",
+                "required": false,
+                "schema": {
+                    "type": "string",
+                    "enum": ["L", "M", "Q", "H"]
+                }
             }
         ],
         "responses": {