* Merge branch &39;master&39; of https://github.com/EBI-Metabolights/metabolights-utils ([`2c16d3c`](https://github.com/EBI-Metabolights/metabolights-utils/commit/2c16d3c425c53808d2558eadbdee9acb110b739c))
1.1.8
Fix
* fix: rollback id field and update investigation tsv file write method ([`ebf17b4`](https://github.com/EBI-Metabolights/metabolights-utils/commit/ebf17b47b70a53d35cc997451ff2ff3b574b9eb8))
* fix: id field is added to base class ([`ef682f4`](https://github.com/EBI-Metabolights/metabolights-utils/commit/ef682f45b9ec8e5a4c26790c339a1d78c87bace3))
Refactor
* refactor: InvestigationFileWriter write method is now aware of inherited classes of Investigation model ([`1928d04`](https://github.com/EBI-Metabolights/metabolights-utils/commit/1928d04ca64cff1a982174b8f61a8d7c96c46658))
1.1.7
Unknown
* Merge branch &39;master&39; of https://github.com/EBI-Metabolights/metabolights-utils ([`600553d`](https://github.com/EBI-Metabolights/metabolights-utils/commit/600553d5c18be24c882b4b0794d05d7fe3302542))
* fix: validation last update timestamp type is int or float. ([`64c65fa`](https://github.com/EBI-Metabolights/metabolights-utils/commit/64c65faee24fa6b72d0870707d1bce893fb5ac45))
Unknown
* Merge pull request 2 from nilshoffmann/master
Fixed type of last_update_timestamp in validation to float. ([`fe2aba1`](https://github.com/EBI-Metabolights/metabolights-utils/commit/fe2aba188f7401566bffc72f7f9c2261f8eb93b5))
* Fixed type of last_update_timestamp in validation to float. ([`d1fe8f5`](https://github.com/EBI-Metabolights/metabolights-utils/commit/d1fe8f5f09999f39b85a0cd515f3c717fec6f07f))
* fix: If there is an undefined characteristics column in sample sheet, set_organism method fails ([`367f919`](https://github.com/EBI-Metabolights/metabolights-utils/commit/367f919ee1731e50283a1e4bedbc26e36488276b))