anchor.diff:            "description": "Optional description of the plunk",
             "html_url": "http://plunker.no.de/SJUZAQ/"
           }
  -      h2 Update a plunk
  +      h3 Update a plunk
   
         p: code POST /plunks/0xF5qW
   
  -      h3 Input
  +      h4 Input
         dl
           dt description
           dd
  
positive.code:           }
          }
  
        h3 Response
  
        pre.headers.
          HTTP/1.1 200 OK
  
negative.code:           "description": "Optional description of the plunk",
            "html_url": "http://plunker.no.de/SJUZAQ/"
          }
        h3 Read a plunk
  
        p: code GET /plunks/0xF5qW
  
        h4 Response
  
        pre.headers.
          HTTP/1.1 200 OK
  