update changelog

CHANGELOG.md

 # Changelog
 All notable changes to this project will be documented in this file.
 
-## [unreleased] - 9th february 2020
+## [1.2.0] - 28th april 2020
 ### Added
 
 * copy and rename files generated from results/18_table_assigned_sequences/ to results/ folder
-* `script/cat_samples_into_runs.sh` bash script to merge {sample} files into {projmarkrun} file
+* `scripts/cat_samples_into_runs.sh` bash script to merge {sample} files into {projmarkrun} file
+* custom reference database taxonomic assignment rules
+* custom reference base taxonomic assignment config parameters
+* `scripts/link_custom_runs` bash script to duplicate as symlink each {projet}/{marker}/{run} analysis in order to process parallel analysis on custom reference database in addition to the ncbi reference database
 
 ### Changed