chore: Update .editorconfig (#112)

Add support for Markdown and Docker files.

Signed-off-by: Klaus Smolin <smolin@de.ibm.com>
Co-authored-by: Jacob Emery <jacob.emery@ibm.com>

.editorconfig

@@ -10,10 +10,17 @@ indent_style = space
 indent_size = 2
 trim_trailing_whitespace = true
 
+[Dockerfile]
+indent_size = 4
+
 # Tab indentation (no size specified)
 [Makefile]
 indent_style = tab
 
+# Don't mess with markdown files
+[*.md]
+trim_trailing_whitespace = false
+
 [*.py]
 indent_size = 4