enhance(tools):增加证书生成成功的提示。

cert_tools/src/generate_key.rs

@@ -15,14 +15,14 @@ pub struct GenerateKeyOptions {
 }
 
 pub fn generate_key_file(options: GenerateKeyOptions) {
-    if let Err(e) = cert_lib::generate_certificate(
+    cert_lib::generate_certificate(
         options.output_path.unwrap_or(String::from(".")).as_ref(),
         &options.name,
         4096,
         options.validity_periods.unwrap_or(365),
         options.version.unwrap_or(1),
         options.serial,
-    ) {
-        println!("Failed to generate certificate, due to: {}", e.to_string());
-    }
+    )
+    .expect("generate certificate failed");
+    println!("Certificate generated.");
 }