chore(docs/decisions-log.md): document a broken update of Liquibase 4.6.1

Relate to #1549

[skip ci]

Author: php-coder

docs/decisions-log.md

@@ -2,6 +2,7 @@
 
 | Date/Type | Description |
 | --------- | ----------- |
+| 10.11.2021 Workaround | [php-coder/mystamps#1549](https://github.com/php-coder/mystamps/issues/1549): During update of **Liquibase** from 4.5.0 to 4.6.1 the bug has been faced -- the migration `0.4/2017-05-29--test_image.xml` has started to fail with error `BLOB resource not found: /test/test.png`. I postponed this update and filled a bug report to upstream. Bug: [liquibase/liquibase#2200](https://github.com/liquibase/liquibase/issues/2200) |
 | 02.07.2021 Workaround | Enablement of `GuardLogStatement` in **PMD** led to a few false positives when we concatenate constant string literals. This should be fixed in PMD >= 6.36.0 but until we have this version (see [php-coder/mystamps#1250](https://github.com/php-coder/mystamps/issues/1250)), I suppressed violations manually. Bug: [pmd/pmd#957](https://github.com/pmd/pmd/issues/957) Commits: [0b135cb4](https://github.com/php-coder/mystamps/commit/0b135cb41f2da6d5ffc6570acf0ae68db35295f7) |
 | 02.07.2021 Workaround | [php-coder/mystamps#1536](https://github.com/php-coder/mystamps/issues/1536): `pip install robotframework-lint` has started to fail in TravisCI because one of the transitive dependencies (**robotframework-lint** -> robotframework -> ruamel.yaml.clib 0.2.4) requires at least Python 3.5 In order to unbreak the builds, I pinned the version of `robotframework` but it wasn't enough. Then I pinned the version of **ruamel.yaml.clib** to the latest worked version 0.2.2 Commits: [6c0180cb](https://github.com/php-coder/mystamps/commit/6c0180cb8c90df0d8239b123094ac7d9dd7d29f0), [8447ddb2](https://github.com/php-coder/mystamps/commit/8447ddb2f4944906a97619c9964afff3e2ff7842), [e6186331](https://github.com/php-coder/mystamps/commit/e61863319fdef76417f0e1a31b430aad10226748) | 
 | 09.01.2021 Decision | [php-coder/mystamps#1495](https://github.com/php-coder/mystamps/issues/1495): Let's move **generated images** for the diagrams to the separate branch (`generated-assets`). Later we can apply this approach for other generated content (reports, for example). Pros: it reduces a disk space/repository size because we always hold only the latest version of the images. We will use force-push for rewriting data. Cons: it makes diagram update (especially with PRs) a little more complex because it requires 2 commits (PRs). Commits: [6e7e149f](https://github.com/php-coder/mystamps/commit/6e7e149f84756a6fd817dc23e6e80c145783c784) |