fix(include.rb): explicitly define branch as master

Signed-off-by: Norwid Behrnd <[email protected]>

levels/include.rb

@@ -6,6 +6,7 @@
   FileUtils.touch("first.a")
   FileUtils.touch("second.a")
   FileUtils.touch("lib.a")
+  system "git branch -m master"
   file = File.open(".git/config", "w") do |file|
     file.puts "[core]\nexcludesfile="
   end