rename migen to fpga

build.rs

@@ -2,9 +2,9 @@ use std::process::Command;
 
 fn main() {
     Command::new("python3")
-    		.arg("migen/fpga_config.py")
+    		.arg("fpga/fpga_config.py")
     		.spawn()
     		.expect("FPGA bitstream file cannot be built!");
 
-    println!("cargo:rerun-if-changed=migen/fpga_config.py")
+    println!("cargo:rerun-if-changed=fpga/fpga_config.py")
 }