cleanup: rubocop: fix Layout/IndentHeredoc in Redmine::UnifiedDiffTest#test_line_starting_with_dashes

git-svn-id: http://svn.redmine.org/redmine/trunk@18974 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/unit/lib/redmine/unified_diff_test.rb

@@ -113,7 +113,7 @@ DIFF
   end
 
   def test_line_starting_with_dashes
-    diff = Redmine::UnifiedDiff.new(<<-DIFF
+    diff = Redmine::UnifiedDiff.new(<<~DIFF)
       --- old.txt Wed Nov 11 14:24:58 2009
       +++ new.txt Wed Nov 11 14:25:02 2009
       @@ -1,8 +1,4 @@
@@ -134,7 +134,6 @@ DIFF
       +Another chunk of changes
 
     DIFF
-    )
     assert_equal 1, diff.size
   end