chore(core): add *.ts to .editorconfig (#527)

.editorconfig

@@ -1,6 +1,6 @@
 root = true
 
-[{*.html,*.js,*.json,*.md,*.yml,*eslintrc}]
+[{*.html,*.js,*.json,*.md,*.ts,*.yml,*eslintrc}]
 indent_style = space
 indent_size = 2
 insert_final_newline = true