增加xcconfig配置 review by 草莓

@@ -18,5 +18,10 @@ Pod::Spec.new do |s|
   s.preserve_paths = 'LICENSE', 'README.md', 'package.json', 'index.js'
   s.source_files   = 'ios/*.{h,m}'
 
+  s.xcconfig = { "HEADER_SEARCH_PATHS" => [
+      "${PODS_ROOT}/../React/RCTAssert",
+    ].join(' ') 
+  }
+
   s.dependency 'React'
 end