Prepending seems to delete entries

[jcohenadad]

with changelog-neuropoly v1.0.1

Syntax + output

julien-macbook:~/code/spine-generic/data-multi-subject $ changelog spine-generic/data-multi-subject --update --log-level DEBUG            
INFO Checking API rate limits:
DEBUG Starting new HTTPS connection (1): api.github.com:443
DEBUG https://api.github.com:443 "GET /rate_limit HTTP/1.1" 200 None
DEBUG api rate limit stats: limit=5000, remaining=5000, reset=2020-11-30 16:10:22
DEBUG rate_limits: {'resources': {'core': {'limit': 5000, 'used': 517, 'remaining': 4483, 'reset': 1606770622}, 'search': {'limit': 30, 'used': 0, 'remaining': 30, 'reset': 1606769444}, 'graphql': {'limit': 5000, 'used': 0, 'remaining': 5000, 'reset': 1606772984}, 'integration_manifest': {'limit': 5000, 'used': 0, 'remaining': 5000, 'reset': 1606772984}, 'source_import': {'limit': 100, 'used': 0, 'remaining': 100, 'reset': 1606769444}, 'code_scanning_upload': {'limit': 500, 'used': 0, 'remaining': 500, 'reset': 1606772984}}, 'rate': {'limit': 5000, 'used': 517, 'remaining': 4483, 'reset': 1606770622}}
INFO Core api limit=5000 remaining=4483 reset=2020-11-30 16:10:22
INFO Search api limit=30 remaining=30 reset=2020-11-30 15:50:44
DEBUG Starting new HTTPS connection (1): api.github.com:443
DEBUG https://api.github.com:443 "GET /repos/spine-generic/data-multi-subject/milestones HTTP/1.1" 200 None
DEBUG api rate limit stats: limit=5000, remaining=5000, reset=2020-11-30 16:10:22
DEBUG Open milestones found: [{'url': 'https://api.github.com/repos/spine-generic/data-multi-subject/milestones/3', 'html_url': 'https://github.com/spine-generic/data-multi-subject/milestone/3', 'labels_url': 'https://api.github.com/repos/spine-generic/data-multi-subject/milestones/3/labels', 'id': 5901380, 'node_id': 'MDk6TWlsZXN0b25lNTkwMTM4MA==', 'number': 3, 'title': 'r20201130', 'description': '', 'creator': {'login': 'jcohenadad', 'id': 2482071, 'node_id': 'MDQ6VXNlcjI0ODIwNzE=', 'avatar_url': 'https://avatars1.githubusercontent.com/u/2482071?v=4', 'gravatar_id': '', 'url': 'https://api.github.com/users/jcohenadad', 'html_url': 'https://github.com/jcohenadad', 'followers_url': 'https://api.github.com/users/jcohenadad/followers', 'following_url': 'https://api.github.com/users/jcohenadad/following{/other_user}', 'gists_url': 'https://api.github.com/users/jcohenadad/gists{/gist_id}', 'starred_url': 'https://api.github.com/users/jcohenadad/starred{/owner}{/repo}', 'subscriptions_url': 'https://api.github.com/users/jcohenadad/subscriptions', 'organizations_url': 'https://api.github.com/users/jcohenadad/orgs', 'repos_url': 'https://api.github.com/users/jcohenadad/repos', 'events_url': 'https://api.github.com/users/jcohenadad/events{/privacy}', 'received_events_url': 'https://api.github.com/users/jcohenadad/received_events', 'type': 'User', 'site_admin': False}, 'open_issues': 0, 'closed_issues': 3, 'state': 'open', 'created_at': '2020-09-21T17:50:46Z', 'updated_at': '2020-11-30T20:40:07Z', 'due_on': None, 'closed_at': None}]
DEBUG Starting new HTTPS connection (1): api.github.com:443
DEBUG https://api.github.com:443 "GET /repos/spine-generic/data-multi-subject/releases HTTP/1.1" 200 None
DEBUG api rate limit stats: limit=5000, remaining=5000, reset=2020-11-30 16:10:22
DEBUG Starting new HTTPS connection (1): api.github.com:443
DEBUG https://api.github.com:443 "GET /search/issues?q=milestone%3A%22r20201130%22+is%3Apr+repo%3Aspine-generic%2Fdata-multi-subject+state%3Aclosed+is%3Amerged+no%3Alabel HTTP/1.1" 200 None
DEBUG api rate limit stats: limit=30, remaining=30, reset=2020-11-30 15:50:44
INFO Milestone: r20201130, Label: None, Count: 2
INFO Total number of pull requests with label: 2
DEBUG Starting new HTTPS connection (1): api.github.com:443
DEBUG https://api.github.com:443 "GET /search/issues?q=milestone%3A%22r20201130%22+is%3Apr+repo%3Aspine-generic%2Fdata-multi-subject+state%3Aclosed+is%3Amerged+no%3Alabel HTTP/1.1" 200 None
DEBUG api rate limit stats: limit=30, remaining=30, reset=2020-11-30 15:50:44
INFO Milestone: r20201130, Label: None, Count: 2
INFO Backup created: CHANGES.md.bak
INFO Changelog written into CHANGES.md

Input file (to rename: CHANGES.md):
CHANGES_old.md.txt

Output file:
CHANGES_new.md.txt

Observed behaviour:
the entries within "## r20201001" were erased

[jcohenadad]

ah! the problem might be elsewhere... there was no opened milestone for the october 1st release...

[jcohenadad]

ok i confirm the prepending problem remains-- the information is there, but it's badly prepended:

## r20201001

## r20201130 (2020-11-30)
[View detailed changelog](https://github.com/spine-generic/data-multi-subject/compare/r20201001...r20201130)
 - Fix broken link to analysis instructions.  [View pull request](https://github.com/spine-generic/data-multi-subject/pull/61)
[View detailed changelog](https://github.com/spine-generic/data-multi-subject/compare/r20200917...r20201001)
 - Create LICENSE.  [View pull request](https://github.com/spine-generic/data-multi-subject/pull/55)
 - Update participants.tsv.  [View pull request](https://github.com/spine-generic/data-multi-subject/pull/53)

instead of

## r20201130 (2020-11-30)
[View detailed changelog](https://github.com/spine-generic/data-multi-subject/compare/r20201001...r20201130)
 - Fix broken link to analysis instructions.  [View pull request](https://github.com/spine-generic/data-multi-subject/pull/61)

## r20201001
[View detailed changelog](https://github.com/spine-generic/data-multi-subject/compare/r20200917...r20201001)
 - Create LICENSE.  [View pull request](https://github.com/spine-generic/data-multi-subject/pull/55)
 - Update participants.tsv.  [View pull request](https://github.com/spine-generic/data-multi-subject/pull/53)