[bld] update changelog for new release.

Signed-off-by: Dimitris Lampridis <dimitris.lampridis@cern.ch>

CHANGELOG.rst

@@ -9,18 +9,27 @@ Change Log
 - Format inspired by: `Keep a Changelog <https://keepachangelog.com/en/1.0.0/>`_
 - Versioning scheme follows: `Semantic Versioning <https://semver.org/spec/v2.0.0.html>`_
 
-Unreleased
-==========
-https://www.ohwr.org/project/general-cores/compare/master...proposed_master
+1.0.4 - 2020-03-26
+==================
+https://www.ohwr.org/project/general-cores/tags/v1.0.4
 
 Added
 -----
 - [hdl] VHDL functions to convert characters and strings to upper/lower case.
-- [sw][i2c] support for kernel greater than 4.7.
+- [sw][i2c] Support for kernel greater than 4.7.
+- [hdl] Separate synchroniser and edge detection modules.
+- [hdl] 8b10b encoder.
 
 Changed
 -------
 - [hdl] Rewritten the WB master interface used in simulations.
+- [hdl] Reimplement gc_sync_ffs using new synchroniser and edge detectors.
+
+Fixed
+-----
+- [sw][spi] Align polarity and phase for Rx and Tx.
+- [hdl][i2c] Fix reset lock for I2C master.
+- [hdl] Avoid cyclic dependencies for log2 ceiling functions.
 
 1.0.3 - 2020-01-15
 ==================