Add vendor folder to git

vendor/github.com/go-openapi/spec/fixtures/expansion/circularSpec.yaml

@@ -0,0 +1,67 @@
+---
+swagger: "2.0"
+info:
+  title: Swagger Sample
+  description: Sample API Playground.
+  version: 1.0.0
+basePath: /v1
+schemes:
+- http
+consumes:
+- application/vdn.sample.v1+json
+produces:
+- application/vdn.sample.v1+json
+
+paths:
+  /books:
+    get:
+      summary: List all books
+      operationId: listBooks
+      tags:
+        - books
+      responses:
+        200:
+          headers:
+            Link:
+              type: string
+          description: An array of books
+          schema:
+            type: array
+            items:
+              $ref: "#/definitions/Book"
+        default:
+          description: generic error response
+          schema:
+            $ref: "#/definitions/Error"
+
+definitions:
+  Book:
+    type: object
+    required:
+      - title
+      - summary
+    properties:
+      title:
+        type: string
+        example: Winnie the Pooh
+      summary:
+        type: string
+        example: Famous children's book
+      related_books:
+        type: array
+        items:
+          $ref: "#/definitions/Book"
+
+  Error:
+    type: object
+    readOnly: true
+    properties:
+      code:
+        type: integer
+        format: int64
+        example: 400
+      message:
+        type: string
+        example: Unexpected error
+    required:
+      - message