Add blog post "Metafacture-core release 5.5.0"

content/blog/metafacture-core-5.5.0/index.md

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+---
+title: Metafacture-core release 5.5.0
+date: "2023-03-04T14:36:03.2300Z"
+description: "This is about changes coming with the metafacture-core release 5.5.0"
+authors: [{lastname: "Christoph",
+           firstname: "Pascal"}]
+---
+
+*Preamble*
+
+This post describes the new developments in `metafacture-core release 5.5.0` since the [release
+of metafacture-core-5.4.0](https://blog.metafacture.org/metafacture-core-5.4.0/) in September 2022.
+
+## Table of Contents
+
+```toc
+# this will be replaced by the toc
+```
+
+## Changes
+
+### New Features
+
+- JSON: schema validator [#443](https://github.com/metafacture/metafacture-core/issues/443)
+- Metamorph: Optionally set key and/or value column in FileMap [#471](https://github.com/metafacture/metafacture-core/pull/471)
+- Metamorph: Option to ignore lines matching pattern in FileMap [#472](https://github.com/metafacture/metafacture-core/pull/472)
+- IO: Optionally let ObjectFileWriter append to existing file instead of overwriting [#475](https://github.com/metafacture/metafacture-core/pull/475)
+
+Have a look at [flux-commands](https://github.com/metafacture/metafacture-documentation/blob/master/flux-commands.md) how to use these features.
+
+### Bug fixes
+
+- IO: setters would only take effect for subsequently opened files in ObjectFileWriter
+