add Liechtenstein to country selection

[Caahlo]

add Liechtenstein to country selection and document its municipalities as regions

CATEGORY

Choose one

• Bug Fix
• Enhancement (new features, refinement)
• Refactor
• Add tests
• Build / Development Environment
• Documentation

SUMMARY

Add Liechtenstein to the documentation and to the country map drop-down menu
requires: apache-superset/superset-ui-plugins#263

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TEST PLAN

1. Go to the charts list
2. Click on the "Birth in France by department in 2016" link
3. under "Options" in the "Country Name" drop-down menu, select "Liechtenstein"

Expected

The borders of the cantons of Liechtenstein should appear in pale gray.

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

REVIEWERS

[codecov-io]

Codecov Report

Merging #8605 into master will decrease coverage by 5.99%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #8605      +/-   ##
==========================================
- Coverage   71.69%   65.69%      -6%     
==========================================
  Files         118      474     +356     
  Lines       12591    23583   +10992     
  Branches        0     2571    +2571     
==========================================
+ Hits         9027    15494    +6467     
- Misses       3564     7920    +4356     
- Partials        0      169     +169

Impacted Files	Coverage Δ
superset/assets/src/explore/controls.jsx	42.18% <ø> (ø)
superset/assets/src/components/Checkbox.jsx	100% <0%> (ø)
.../assets/src/dashboard/reducers/dashboardFilters.js	88.46% <0%> (ø)
...ets/src/dashboard/components/dnd/DragDroppable.jsx	94.59% <0%> (ø)
superset/assets/src/components/EditableTitle.jsx	81.81% <0%> (ø)
...src/explore/components/controls/VizTypeControl.jsx	78.84% <0%> (ø)
...t/assets/src/components/InfoTooltipWithTrigger.jsx	41.66% <0%> (ø)
.../src/dashboard/components/UndoRedoKeylisteners.jsx	9.52% <0%> (ø)
...ts/src/explore/components/ExploreActionButtons.jsx	100% <0%> (ø)
.../src/dashboard/components/FilterTooltipWrapper.jsx	100% <0%> (ø)
... and 347 more

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[dpgaspar]

Could you take the chance and update the doc on visualization.rst with the current declared select_country map?