Updating-and-release-notes.md

-### Current version: `3.0.1b3`
+### Current version: `3.0.1b4`
 
 You can check the version installed by running `obi --version`
 
@@ -21,6 +21,11 @@ python3 setup.py install
 
 ### Release notes:
 
+* `3.0.1b4`:
+  - `ngsfilter`: fixed critical bug where barcodes shorter than the forward primer would be missed
+
+  - `import`: fixed the import of tabular files with no header
+  
 * `3.0.1b3`:
   - `uniq`: now OK to use *-m* option even if only one unique key in information to merge (e.g. one sample)