Fix issue with frozen string literals

Close #73

Author: tagliala

lib/hawk/model/base.rb

@@ -24,10 +24,15 @@ def initialize(attributes = {}, params = {})
       end
 
       def inspect
-        attributes = schema.inject('') do |s, (k, _v)|
-          s << " #{k}=#{read_attribute(k).inspect}"
+        result = "#<#{self.class.name}"
+
+        schema.each_key do |k|
+          result << " #{k}=#{read_attribute(k).inspect}"
         end
-        "#<#{self.class.name}#{attributes}>"
+
+        result << '>'
+
+        result
       end
     end
   end

spec/basic_operations_spec.rb

@@ -124,4 +124,16 @@ class Person < Hawk::Model::Base
       expect(person).to be_a(Person)
     end
   end
+
+  describe '#inspect' do
+    it 'returns a string representation of the model' do
+      stub_request(:GET, 'https://example.org/people/2')
+        .with(headers: { 'User-Agent' => 'Foobar' })
+        .to_return(status: 200, body: person_attributes.to_json, headers: {})
+
+      person = Person.find(2)
+
+      expect(person.inspect).to eq('#<Person id=2 name="Woody Allen">')
+    end
+  end
 end