add whitespace to changelog

Author: dilpath

CHANGELOG.md

@@ -5,6 +5,7 @@
 ### 0.4.0
 
 **Prepare for PEtab v2**
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 To enable ongoing support for PEtab v1, while "forking" the v1 code for PEtab v2, the old code base is now available at `petab.v1`, and the new code base will be at `petab.v2`. For now, old `import petab.*` statements still work, but are marked as deprecated, and `import petab.v1.*` should be used instead. `petablint` will be designed for use with only full PEtab problems in future too, rather than individual tables -- partial problems will be supported to validate individual tables.
 
 * Add PEtab math parser and sympy converter by @dweindl in https://github.com/PEtab-dev/libpetab-python/pull/260
@@ -16,6 +17,7 @@ To enable ongoing support for PEtab v1, while "forking" the v1 code for PEtab v2
 * Fix imports related to v1 subpackage by @dweindl in https://github.com/PEtab-dev/libpetab-python/pull/293
 
 **Validation**
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 Validation will become increasingly atomic and OOP, to support extension-specific validation in PEtab v2.
 
 * Validator: check for positive bounds for log-scaled parameter by @dweindl in https://github.com/PEtab-dev/libpetab-python/pull/278
@@ -24,19 +26,23 @@ Validation will become increasingly atomic and OOP, to support extension-specifi
 * New validation API by @dweindl in https://github.com/PEtab-dev/libpetab-python/pull/288
 
 **Packaging and CI**
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 * setup.py -> pyproject.toml by @dweindl in https://github.com/PEtab-dev/libpetab-python/pull/275
 * Ruff pyupgrade: python3.10 by @dweindl in https://github.com/PEtab-dev/libpetab-python/pull/276
 
 **Documentation**
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 * Doc: fix formatting / missing type annotations by @dweindl in https://github.com/PEtab-dev/libpetab-python/pull/292
 * Doc: versioning and deprecation policy by @dweindl in https://github.com/PEtab-dev/libpetab-python/pull/277
 
 **Other changes**
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 * Simplify yaml schema by @dweindl in https://github.com/PEtab-dev/libpetab-python/pull/264
 * Handle numpy types in sympify_petab by @dweindl in https://github.com/PEtab-dev/libpetab-python/pull/294
 * New `get_path_prefix` method to get the base path for relative paths in PEtab problem YAML by @dweindl in https://github.com/PEtab-dev/libpetab-python/pull/280
 
 **New Contributors**
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 * @dependabot made their first contribution in https://github.com/PEtab-dev/libpetab-python/pull/267
 
 **Full Changelog**: https://github.com/PEtab-dev/libpetab-python/compare/v0.3.0...v0.4.0