Fix up bin/profile

Author: kddnewton

bin/profile

@@ -4,13 +4,14 @@
 require "bundler/setup"
 require "stackprof"
 
-filepath = File.expand_path("../lib/syntax_tree", __dir__)
-require_relative filepath
+$:.unshift(File.expand_path("../lib", __dir__))
+require "syntax_tree"
 
 GC.disable
 
 StackProf.run(mode: :cpu, out: "tmp/profile.dump", raw: true) do
-  SyntaxTree.format(File.read("#{filepath}.rb"))
+  filepath = File.expand_path("../lib/syntax_tree/node.rb", __dir__)
+  SyntaxTree.format(File.read(filepath))
 end
 
 GC.enable