cassandra:connections[0] uses 'type' instead of 'componentType'

[Alex Mills]

It seems to be allowed to include unspecified keys (according to the use of data in other example checks) but according to the spec, componentType SHOULD be included whenever componentId is included, so this appears to be a typo.

Relevant snippet from draft.md included below.

    "cassandra:connections": [
      {
        "componentId": "dfd6cf2b-1b6e-4412-a0b8-f6f7797a60d2",
        "type": "datastore",
        "observedValue": 75,
        "status": "warn",
        "time": "2018-01-17T03:36:48Z",
        "output": "",
        "links": {
          "self": "http://api.example.com/dbnode/dfd6cf2b/health"
        }
      }
    ],

[Irakli Nadareishvili]

Good catch. Thank you. Fixed in 6f2c8d9