(ruby): Make the #add method a class method

This mimics the structure we'll need when processing the Lambda events

Author: alex9smith

lambda/ruby/lib/lambda_function.rb

@@ -1,7 +1,7 @@
 module Lambda
     class Handler
-        def add(first, second)
-            return first + second
+        def self.add(first, second)
+            first + second
         end
     end
 end

lambda/ruby/spec/lambda_function_spec.rb

@@ -5,7 +5,7 @@
     describe "#add" do
         it "adds two numbers together" do
             handler = 
-            expect(Lambda::Handler.new.add(1,2)).to eq(3) 
+            expect(Lambda::Handler.add(1,2)).to eq(3) 
         end
     end
 end