add more complete editorconfig to match other projects in the ecosystem [skip ci]

Author: mojavelinux

Diff for: .editorconfig

@@ -1,3 +1,9 @@
+root = true
+
 [*]
-# this matches the setting in .gitattributes
+indent_style = space
+indent_size = 2
 end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true

Diff for: .rubocop.yml

@@ -11,7 +11,6 @@ Layout/BeginEndAlignment:
 Layout/CaseIndentation:
   EnforcedStyle: end
 Layout/EndOfLine:
-  # this matches the setting in .gitattributes
   EnforcedStyle: lf
 Layout/EmptyLineAfterGuardClause:
   Enabled: false