feat!: support stable release branch names (#720)

BREAKING CHANGE: removed per page parameter from GitHub#findMergedReleasePR and moved some internal helpers

__snapshots__/github-release.js

@@ -11,107 +11,6 @@ exports['GitHubRelease createRelease attempts to guess package name for release
   ]
 }
 
-exports['GitHubRelease extractLatestReleaseNotes handles CHANGELOG with old and new format entries 1'] = `
-
-
-### Bug Fixes
-
-* **deps:** update dependency google-auth-library to v4 ([#79](https://www.github.com/googleapis/nodejs-rcloadenv/issues/79)) ([1386b78](https://www.github.com/googleapis/nodejs-rcloadenv/commit/1386b78))
-
-
-### Build System
-
-* upgrade engines field to >=8.10.0 ([#71](https://www.github.com/googleapis/nodejs-rcloadenv/issues/71)) ([542f935](https://www.github.com/googleapis/nodejs-rcloadenv/commit/542f935))
-
-
-### Miscellaneous Chores
-
-* **deps:** update dependency gts to v1 ([#68](https://www.github.com/googleapis/nodejs-rcloadenv/issues/68)) ([972b473](https://www.github.com/googleapis/nodejs-rcloadenv/commit/972b473))
-
-
-### BREAKING CHANGES
-
-* **deps:** this will ship async/await with the generated code.
-* upgrade engines field to >=8.10.0 (#71)
-
-`
-
-exports['GitHubRelease extractLatestReleaseNotes handles CHANGELOG with old format entries 1'] = `
-
-03-22-2019 10:34 PDT
-
-### New Features
-- feat: add additional entity types ([#220](https://github.com/googleapis/nodejs-language/pull/220))
-
-### Internal / Testing Changes
-- chore: publish to npm using wombat ([#218](https://github.com/googleapis/nodejs-language/pull/218))
-- build: use per-repo npm publish token ([#216](https://github.com/googleapis/nodejs-language/pull/216))
-
-`
-
-exports['GitHubRelease extractLatestReleaseNotes handles CHANGELOG with new format entries 1'] = `
-
-
-### Bug Fixes
-
-* candidate issue should only be updated every 15 minutes. ([#70](https://www.github.com/googleapis/release-please/issues/70)) ([edcd1f7](https://www.github.com/googleapis/release-please/commit/edcd1f7))
-
-
-### Features
-
-* add GitHub action for generating candidate issue ([#69](https://www.github.com/googleapis/release-please/issues/69)) ([6373aed](https://www.github.com/googleapis/release-please/commit/6373aed))
-* checkbox based releases ([#77](https://www.github.com/googleapis/release-please/issues/77)) ([1e4193c](https://www.github.com/googleapis/release-please/commit/1e4193c))
-
-`
-
-exports['GitHubRelease extractLatestReleaseNotes extracts appropriate release notes when prior release is patch 1'] = `
-
-
-### ⚠ BREAKING CHANGES
-
-* temp directory now defaults to setting for report directory
-
-### Features
-
-* default temp directory to report directory ([#102](https://www.github.com/bcoe/c8/issues/102)) ([8602f4a](https://www.github.com/bcoe/c8/commit/8602f4a))
-* load .nycrc/.nycrc.json to simplify migration ([#100](https://www.github.com/bcoe/c8/issues/100)) ([bd7484f](https://www.github.com/bcoe/c8/commit/bd7484f))
-
-`
-
-exports['GitHubRelease extractLatestReleaseNotes php-yoshi extracts appropriate release notes, when multiple packages updated 1'] = `
-
-<details><summary>google/cloud-bigquerydatatransfer 0.11.1</summary>
-
-
-
-### Bug Fixes
-
-* Fix BigQueryDataTransfer smoke test ([#2046](https://www.github.com/googleapis/google-cloud-php/issues/2046)) ([98c7c9e](https://www.github.com/googleapis/google-cloud-php/commit/98c7c9e))
-
-</details>
-
-<details><summary>google/cloud-dlp 0.20.0</summary>
-
-
-
-### Features
-
-* Add support for avro ([#2050](https://www.github.com/googleapis/google-cloud-php/issues/2050)) ([4137f3d](https://www.github.com/googleapis/google-cloud-php/commit/4137f3d))
-
-</details>
-
-<details><summary>google/cloud-kms 1.4.0</summary>
-
-
-
-### Features
-
-* Update KMS client. ([#2045](https://www.github.com/googleapis/google-cloud-php/issues/2045)) ([c96da32](https://www.github.com/googleapis/google-cloud-php/commit/c96da32))
-
-</details>
-
-`
-
 exports['GitHubRelease createRelease creates and labels release on GitHub 1'] = {
   "tag_name": "v1.0.3",
   "body": "\n* entry",