Fix tech type in spec

Author: pcothenet

spec/integration/projects_spec.rb

@@ -25,7 +25,7 @@
       expect(project.country).to eq country
     end
 
-    type = 'dac'
+    type = 'biogas'
     projects = Patch::Project.retrieve_projects(type: type)
     projects.data.map do |project|
       expect(project.type).to eq type