Add changelog with the 1.3.0 release information

CHANGELOG.md

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+# Changelog
+
+- [Changelog](#changelog)
+  - [1.3.0](#130)
+
+## 1.3.0
+
+Release Date: 2023-11-01
+
+### Added
+
+- New BCH decoder implementation performing at least 2.5x faster than the previous one.
+- BCH decoder benchmarking application for comparison between the original gr-dvbs2rx BCH decoder (based on [aicodix/code](https://github.com/aicodix/code/)), the AFF3CT [DVB-S2 BCH decoder](https://github.com/aff3ct/dvbs2), and the new BCH decoder implementation.
+- `dvbs2-rec` application for recording IQ samples from a DVB-S2 signal and storing them in Signal Metadata Format (SigMF).
+- Proposal of [SigMF extension for DVB-S2](docs/dvbs2.sigmf-ext.md).
+
+### Changed
+
+- Replaced the unpacked bit stream interface of the BBFRAME processing (descrambler and deheader) and LDPC decoder blocks with a bit-packed stream interface for better performance.
+
+### Fixed
+
+- Compilation on AppleClang.
+- Runtime library version parsing on macOS.