updates trees.

This will create merge conflict with #119. Merge with strategy theirs.

Author: lorenzwalthert

tests/testthat/indention_multiple/overall-in_tree

@@ -14,7 +14,8 @@ a <- function(x) {
     }
   })
   # we like comments too
-  c(list(x + 2),
+  c(
+    list(x + 2),
     c(c(
       26 ^ 2, # FIXME ^ operator has to be surrounded by one space (or none?!), never multiple
       8,