Merge pull request #970 from Shopify/at-fix-sig-loc

Use correct type for `RBI::Sig#loc` during translation

Author: Morriar

lib/spoom/sorbet/translate/sorbet_sigs_to_rbs_comments.rb

@@ -180,7 +180,7 @@ def visit_sig(node)
           return unless sorbet_sig?(node)
 
           builder = RBI::Parser::SigBuilder.new(@ruby_contents, file: @file)
-          builder.current.loc = node.location
+          builder.current.loc = RBI::Loc.from_prism(@file, node.location)
           builder.visit_call_node(node)
           builder.current.comments = []