Update to v1.3.0 Mustache spec.

src/Mustache/Engine.php

@@ -23,8 +23,8 @@
  */
 class Mustache_Engine
 {
-    const VERSION        = '2.14.2';
-    const SPEC_VERSION   = '1.2.2';
+    const VERSION      = '2.14.2';
+    const SPEC_VERSION = '1.3.0';
 
     const PRAGMA_FILTERS       = 'FILTERS';
     const PRAGMA_BLOCKS        = 'BLOCKS';

vendor/spec

@@ -1 +1 @@
-Subproject commit 1704964eb6cd0c8b1a3da3de6222e0f0480284ec
+Subproject commit 5d3b58ea35ae309c40d7a8111bfedc4c5bcd43a6