update with latest syntax submodule

Author: jchavarri

.gitmodules

@@ -8,5 +8,5 @@
 	branch = master
 [submodule "ninja"]
 	path = ninja
-	url = git@github.com:rescript-lang/ninja.git
+	url = https://github.com/rescript-lang/ninja
 	ignore = untracked

jscomp/syntax/ppx_entry.ml

@@ -29,7 +29,7 @@ let rewrite_signature (ast : Parsetree.signature) : Parsetree.signature =
   Ast_config.iter_on_bs_config_sigi ast; 
   let ast = 
     match !Js_config.jsx_version with
-    | 3 -> Reactjs_jsx_ppx.rewrite_signature ast 
+    | 3 -> Reactjs_jsx_ppx_v3.rewrite_signature ast 
     | _ -> ast 
     (* react-jsx ppx relies on built-in ones like `##` *)
   in 
@@ -48,7 +48,7 @@ let rewrite_implementation (ast : Parsetree.structure) : Parsetree.structure =
   Ast_config.iter_on_bs_config_stru ast ;   
   let ast = 
     match !Js_config.jsx_version with     
-    | 3 -> Reactjs_jsx_ppx.rewrite_implementation ast 
+    | 3 -> Reactjs_jsx_ppx_v3.rewrite_implementation ast 
     | _ -> ast 
   in 
   if !Js_config.no_builtin_ppx then ast else