Ensure Int nodes with preceding unary + get formatted properly.

Author: kddnewton

CHANGELOG.md

@@ -58,6 +58,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) a
 - Ensure nested `HshPtn` nodes use braces.
 - Force using braces if the block is within a `Binary` within the predicate of a loop or conditional.
 - Make sure `StringLiteral` and `StringEmbExpr` know that they can be extended by heredocs.
+- Ensure `Int` nodes with preceding unary `+` get formatted properly.
 
 ### Removed
 

lib/syntax_tree.rb

@@ -7220,7 +7220,7 @@ def child_nodes
     end
 
     def format(q)
-      if !value.start_with?("0") && value.length >= 5 && !value.include?("_")
+      if !value.start_with?(/\+?0/) && value.length >= 5 && !value.include?("_")
         # If it's a plain integer and it doesn't have any underscores separating
         # the values, then we're going to insert them every 3 characters
         # starting from the right.