dot editorconfig

[michelp]

For some reason github formats tabs as eight spaces, this messes up the formatting of sql files in pg_pathman. For example compare:

https://github.com/postgrespro/pg_pathman/blob/master/range.sql

to:

https://github.com/michelp/pg_pathman/blob/master/range.sql

this PR drops an editorconfig file to improve formatting.

[funbringer]

Hi @michelp,

Thank you for your contribution! That's a really neat feature.

PS looks like our testing framework chose a bad port.

[codecov-io]

Codecov Report

Merging #103 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #103   +/-   ##
=======================================
  Coverage   92.78%   92.78%           
=======================================
  Files          28       28           
  Lines        5366     5366           
  Branches      880      880           
=======================================
  Hits         4979     4979           
  Misses        387      387

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