(puppetlabsGH-256) Fix calling getDependencies in 1.0

Previously the puppetfile-resolver endpoint was created with version 0.x of
Editor Services.  Now that 1.0 is being worked on, the method call has changed
slightly.

lib/puppet-languageserver/message_handler.rb

@@ -103,11 +103,11 @@ def request_puppetfile_getdependencies(_, json_rpc_message)
       file_uri = json_rpc_message.params['uri']
       return LSP::PuppetfileDependencyResponse.new('error' => 'Must be a puppetfile in order to find dependencies.') unless documents.document_type(file_uri) == :puppetfile
 
-      content = documents.document(file_uri)
+      document = documents.document(file_uri)
 
       result = []
       begin
-        result = PuppetLanguageServer::Puppetfile::ValidationProvider.find_dependencies(content)
+        result = PuppetLanguageServer::Puppetfile::ValidationProvider.find_dependencies(document.content)
       rescue StandardError => e
         PuppetLanguageServer.log_message(:error, "(puppetfile/getdependencies) Error parsing puppetfile. #{e}")
         return LSP::PuppetfileDependencyResponse.new('error' => 'An internal error occured while parsing the puppetfile. Please see the debug log files for more information.')