Cannot generate release notes for a snapshot, i.e what has not been released yet

Is it possible to generate release notes for a snapshot, i.e. all of the work up to the point before a release.

gren release

🤖 - Generate release notes:
===================================
⠙ Getting the list of releases{ Error: 404 error making request GET https://XXXXX/releases: "Not Found"
at new ResponseError (/usr/local/lib/node_modules/github-release-notes/node_modules/github-api/dist/components/Requestable.js:50:118)
at handler (/usr/local/lib/node_modules/github-release-notes/node_modules/github-api/dist/components/Requestable.js:373:18)
at
at process._tickCallback (internal/process/next_tick.js:188:7)
path: 'XXXXreleases',
request:
{ adapter: [Function: httpAdapter],
transformRequest: { '0': [Function: transformRequest] },
transformResponse: { '0': [Function: transformResponse] },
timeout: 0,
xsrfCookieName: 'XSRF-TOKEN',
xsrfHeaderName: 'X-XSRF-TOKEN',
maxContentLength: -1,
validateStatus: [Function: validateStatus],
headers:
{ Accept: 'application/vnd.github.v3+json',
'Content-Type': 'application/json;charset=UTF-8',
Authorization: 'token XXXX',
'User-Agent': 'axios/0.15.3' },
method: 'GET',
url: 'https://XXXX/releases',
params: { per_page: 30, page: 1 },
data: undefined,
responseType: 'json' },
response:
{ status: 404,
statusText: 'Not Found',
headers: