fix author string for poetry 1.8

pyproject.toml

@@ -27,7 +27,7 @@ readme = "README.md"
 Changelog = "https://github.com/pydna-group/pydna/blob/master/docs/CHANGELOG.md#changelog"
 [tool.poetry]
 description = "Representing double stranded DNA and functions for simulating cloning and homologous recombination between DNA molecules."
-authors = ["Björn F. Johansson<[email protected]>", "Manuel Lera-Ramirez<[email protected]>"]
+authors = ["Björn F. Johansson <[email protected]>", "Manuel Lera-Ramirez <[email protected]>"]
 documentation = "https://pydna-group.github.io/pydna"
 homepage = "https://github.com/pydna-group/pydna#-pydna"
 license = "BSD"