Update open_file to pass options on to Kernel.open, allowing file encoding to be specified.
Update open_file to pass options on to Kernel.open, allowing file encoding to be specified.

dbs/linter,rayrc/linter,rayrc/linter,structured-data/linter,structured-data/linter,rayrc/linter,dbs/linter,dbs/linter,structured-data/linter