Remove obsolete TODO.md (#4850)

TODO.md

@@ -1,48 +0,0 @@
-# TODO
-List of TODO items for Superset
-
-## Important
-* **Getting proper JS testing:** unit tests on the Python side are pretty
-    solid, but now we need a test suite for the JS part of the site,
-    testing all the ajax-type calls
-* **Viz Plugins:** Allow people to define and share visualization plugins.
-    ideally one would only need to drop in a set of files in a folder and
-    Superset would discover and expose the plugins
-
-## Features
-* **Dashboard URL filters:** `{dash_url}#fltin__fieldname__value1,value2`
-* **Default slice:** choose a default slice for the dataset instead of
-    default endpoint
-* **Widget sets / chart grids:** a way to have all charts support making
-    a series of charts and putting them in a grid. The same way that you
-    can groupby for series, you could chart by. The form field set would be
-    common and use a single field to "grid by", a limit number of chart as
-    an N * N grid size.
-* **Advanced dashboard configuration:** currently you can define which
-    slices in a dashboard are immune to filtering.
-* **Annotations layers:** allow for people to maintain data annotations,
-    attached to a layer and time range. These layers can be added on top of
-    some visualizations as annotations. An example of a layer might be
-    "holidays" or "site outages", ...
-* **Slack integration** - TBD
-* **Comments:** allow for people to comment on slices and dashes
-
-
-## Easy-ish fix
-* Build matrix to include mysql using tox
-* CREATE VIEW button from SQL editor
-* Test button for when editing SQL expression
-* Slider form element
-* [druid] Allow for post aggregations (ratios!)
-* in/notin filters autocomplete (druid)
-
-## New viz
-* Maps that use geocodes
-* Time animated scatter plots
-* Horizon charts
-* Calendar heatmap
-* Chord diagram
-* ...
-
-## Community
-* Turorial vids