Add backward compatibility with v1

Author: antonmedv

expr.go

@@ -125,6 +125,13 @@ func Compile(input string, ops ...conf.Option) (*vm.Program, error) {
 	return program, nil
 }
 
+// Parse parses input string to a program.
+//
+// Deprecated: use expr.Compile instead.
+func Parse(input string, ops ...conf.Option) (*vm.Program, error) {
+	return Compile(input, ops...)
+}
+
 // Run evaluates given bytecode program.
 func Run(program *vm.Program, env interface{}) (interface{}, error) {
 	return vm.Run(program, env)