GH-168: Add newline to end of page

Fixes GH-168

##### Before:

```
❯ curl http://127.0.0.1:8080/get
{
  "args": {},
  "headers": {
    "Accept": "*/*",
    "Host": "127.0.0.1:8080",
    "User-Agent": "curl/7.30.0"
  },
  "origin": "127.0.0.1",
  "url": "http://127.0.0.1:8080/get"
}%
```

The `%` at the end indicates the lack of a trailing newline.

##### After:

```
❯ curl http://127.0.0.1:8080/get
{
  "args": {},
  "headers": {
    "Accept": "*/*",
    "Host": "127.0.0.1:8080",
    "User-Agent": "curl/7.30.0"
  },
  "origin": "127.0.0.1",
  "url": "http://127.0.0.1:8080/get"
}
```

I also submitted a PR to Flask for this issue: https://github.com/mitsuhiko/flask/pull/1262