add hotfix notes

docs/release_notes_0.3.2.md

+# Release notes Hotfix 0.3.2
+
+* There was a bug found in our RNA seq pipeline ( Gentrap )
+ * The merged count table missed out on 1 gene consistently. The separate count files per sample where not affected by this bug
+* This bug involved all previous runs from Gentrap of the last 2 months, all customers where informed and if requested a new file is delivered.
+ * we manually checked all the runs and found that the first gene was almost never expressed in our data sets
+ 
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