Add EditorConfig file

Resolve issues.

More info here: https://editorconfig.org/

.editorconfig

@@ -0,0 +1,9 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true

UPGRADING.md

@@ -57,4 +57,3 @@ conn = Faraday.new(...) do |f|
   f.adapter AnyAdapter
 end
 ```
-

docs/_sass/faraday.sass

@@ -127,4 +127,3 @@ footer
   // when needing search usually
   @media screen and (max-width: 800px)
     display: none
-