[AIRFLOW-XXX] Make it clear that 1.10.5 wasn't accidentally omitted from UPDATING.md

[ryw]

Make it clear that 1.10.5 was a minor release, and that there are no breaking changes in the release.

[kaxil]

Thanks @ryw

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@d719e1f). Click here to learn what that means.
The diff coverage is 87.09%.

@@            Coverage Diff            @@
##             master    #6240   +/-   ##
=========================================
  Coverage          ?   79.45%           
=========================================
  Files             ?      610           
  Lines             ?    35261           
  Branches          ?        0           
=========================================
  Hits              ?    28015           
  Misses            ?     7246           
  Partials          ?        0

Impacted Files	Coverage Δ
airflow/contrib/operators/pubsub_operator.py	100% <ø> (ø)
airflow/lineage/datasets.py	84.72% <ø> (ø)
airflow/executors/local_executor.py	82.17% <ø> (ø)
airflow/example_dags/example_gcs_to_gcs.py	100% <ø> (ø)
airflow/contrib/hooks/redis_hook.py	100% <ø> (ø)
...irflow/contrib/operators/gcp_container_operator.py	100% <ø> (ø)
airflow/contrib/hooks/ftp_hook.py	69.02% <ø> (ø)
airflow/contrib/operators/gcp_tasks_operator.py	0% <ø> (ø)
airflow/kubernetes/volume.py	100% <ø> (ø)
...low/contrib/example_dags/example_winrm_operator.py	0% <ø> (ø)
... and 269 more

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[feluelle]

Good point!