Resolve "release v1.2.0"

Closes #257 (closed)

.gitlab/issue_templates/bug.md

+<!-- Use this template for a bug in MLAir. -->
+
+# Bug
+
+## Error description
+<!-- Provide a context when the bug / error arises -->
+
+## Error message
+<!-- Provide the error log if available -->
+
+## First guess on error origin
+<!-- Add first ideas where the error could come from -->
+
+## Error origin
+<!-- Fill this up when the bug / error origin has been found -->
+
+## Solution
+<!-- Short description how to solve the error -->
+