upgrade parser to avoid conflicts with opal

Gemfile.lock

@@ -6,16 +6,16 @@ GIT
 
 GIT
   remote: git://github.com/whitequark/ast.git
-  revision: 3814fb102af82a30bf334005ebe17332744f9dad
+  revision: 93c43433ec4d4344485eb4ea6f8948925f092af1
   branch: master
   specs:
-    ast (2.1.0)
+    ast (2.3.0)
 
 PATH
   remote: .
   specs:
     salama (0.5.0)
-      parser (~> 2.2.0)
+      parser (~> 2.3.0)
       salama-object-file (~> 0.3)
 
 GEM
@@ -60,8 +60,8 @@ GEM
     notiffany (0.1.1)
       nenv (~> 0.1)
       shellany (~> 0.0)
-    parser (2.2.3.0)
-      ast (>= 1.1, < 3.0)
+    parser (2.3.3.1)
+      ast (~> 2.2)
     pry (0.10.4)
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)

salama.gemspec

@@ -13,6 +13,6 @@ Gem::Specification.new do |s|
   s.require_paths = ['lib']
   s.summary = 'Salama is a native object vm without any c, one day possibly a ruby vm'
 
-  s.add_dependency "parser" , "~> 2.2.0"
+  s.add_dependency "parser" , "~> 2.3.0"
   s.add_dependency "salama-object-file" , "~> 0.3"
 end