cli: fix template (#1486)

cli/src/template.rs

@@ -176,7 +176,8 @@ declare_id!("{}");
 #[program]
 pub mod {} {{
     use super::*;
-    pub fn initialize(ctx: Context<Initialize>) -> ProgramResult {{
+
+    pub fn initialize(ctx: Context<Initialize>) -> Result<()> {{
         Ok(())
     }}
 }}