Fixed outdated README example

Author: TheDan64

Diff for: README.md

@@ -90,12 +90,12 @@ fn run() -> Result<(), Box<Error>> {
     Ok(())
 }
 
-fn jit_compile_sum<'engine>(
+fn jit_compile_sum(
     context: &Context,
     module: &Module,
     builder: &Builder,
-    execution_engine: &'engine ExecutionEngine,
-) -> Option<JitFunction<'engine, SumFunc>> {
+    execution_engine: &ExecutionEngine,
+) -> Option<JitFunction<SumFunc>> {
     let i64_type = context.i64_type();
     let fn_type = i64_type.fn_type(&[i64_type.into(), i64_type.into(), i64_type.into()], false);