mercurial: add .t files to .editorconfig
The notable entry here prevents the stripping of trailing whitespace,
which is important in .t tests.
Differential Revision: https://phab.mercurial-scm.org/D3702
--- a/.editorconfig Mon May 28 21:13:32 2018 +0530
+++ b/.editorconfig Thu Jun 07 16:19:18 2018 -0700
@@ -11,3 +11,8 @@
indent_size = 8
indent_style = tab
trim_trailing_whitespace = true
+
+[*.t]
+indent_size = 2
+indent_style = space
+trim_trailing_whitespace = false