Fix issue undefined method 'transform'

Simple path like joallard say to fix with jekyll 3.3.0 and later
#19

Rel to #19

Author: Xavier MORTELETTE

CHANGELOG.md

@@ -1,10 +1,14 @@
+## 0.1.5 2016-12-30
+### minor enhancements
+    * Fixed an error with Jekyll 3.3.0 and later https://github.com/samvincent/jekyll-haml/issues/19
+
 ## 0.1.4 2016-06-01
 ### minor enhancements
-  * Fixed loss of content in layout conversion - ([@sspreitzer][])
+   * Fixed loss of content in layout conversion - ([@sspreitzer][])
 
 ## 0.1.3 2015-12-08
 ### minor enhancements
-  * Fixed an error with Jekyll 2.3.0 (and probably with prior versions) that crashes when building the site - ([@kalvinarts][])
+    * Fixed an error with Jekyll 2.3.0 (and probably with prior versions) that crashes when building the site - ([@kalvinarts][])
 
 ## 0.1.2 2015-04-28
 ### minor enhancements

jekyll-haml.gemspec

@@ -17,6 +17,6 @@ Gem::Specification.new do |gem|
   gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
   gem.require_paths = ["lib"]
 
-  gem.add_runtime_dependency 'jekyll', ">= 0.10.0"
-  gem.add_runtime_dependency 'haml',   ">= 3.0.0"
+  gem.add_runtime_dependency 'jekyll', '>= 3.3.0'
+  gem.add_runtime_dependency 'haml',   '>= 3.0.0'
 end

lib/jekyll-haml/ext/convertible.rb

@@ -5,7 +5,15 @@ class Layout
 
     def initialize(*args)
       old_initialize(*args)
-      self.content = self.transform
+      self.content = transform
+    end
+
+    def transform
+      _renderer.convert(content)
+    end
+
+    def extname
+      ext
     end
   end
 end

lib/jekyll-haml/version.rb

@@ -1,5 +1,5 @@
 module Jekyll
   module Haml
-    VERSION = "0.1.4"
+    VERSION = '0.1.5'.freeze
   end
 end