Migrate template to 2018 edition

Author: h-michael

bindings/neovim_api.rs

@@ -1,7 +1,7 @@
 // Auto generated {{date}}
 
-use neovim::*;
-use rpc::*;
+use crate::neovim::*;
+use crate::rpc::*;
 
 {% for etype in exttypes %}
 #[derive(PartialEq, Clone, Debug)]

bindings/neovim_api_async.rs

@@ -1,20 +1,20 @@
 // Auto generated {{date}}
 
-use neovim::*;
-use neovim_api::*;
-use rpc::*;
-use async::AsyncCall;
+use crate::neovim::*;
+use crate::neovim_api::*;
+use crate::rpc::*;
+use crate::r#async::AsyncCall;
 
 pub trait NeovimApiAsync {
     {% for f in functions if not f.ext %}
     /// since: {{f.since}}
-    fn {{f.name|replace('nvim_', '')}}_async(&mut self, {{f.argstring}}) -> AsyncCall<{{f.return_type.native_type_ret}}>;
+    fn {{f.name|replace('nvim_', '')}}_async(&mut self, {{f.argstring}}) -> AsyncCall<'_, {{f.return_type.native_type_ret}}>;
     {% endfor %}
 }
 
 impl NeovimApiAsync for Neovim {
     {% for f in functions if not f.ext %}
-    fn {{f.name|replace('nvim_', '')}}_async(&mut self, {{f.argstring}}) -> AsyncCall<{{f.return_type.native_type_ret}}> {
+    fn {{f.name|replace('nvim_', '')}}_async(&mut self, {{f.argstring}}) -> AsyncCall<'_, {{f.return_type.native_type_ret}}> {
         self.session.call_async::<{{f.return_type.native_type_ret}}>("{{f.name}}",
                           call_args![{{ f.parameters|map(attribute = "name")|join(", ") }}])
     }