Add missing resources for Carthage

MessageKit.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
    s.name = 'MessageKit'
-   s.version = '0.7.2'
+   s.version = '0.7.3'
    s.license = { :type => "MIT", :file => "LICENSE.md" }
 
    s.summary = 'An elegant messages UI library for iOS.'
@@ -16,7 +16,7 @@ Pod::Spec.new do |s|
    }
 
    s.ios.deployment_target = '9.0'
-   s.ios.resource_bundle = { 'MessageKitAssets' => 'Assets/Images/*.png' }
+   s.ios.resource_bundle = { 'MessageKitAssets' => 'Assets/MessageKitAssets.bundle/Images/*.png' }
 
    s.requires_arc = true
 end