Update the readme about the CocoaPods modular headers usage for Swift project

README.md

@@ -110,19 +110,27 @@ platform :ios, '7.0'
 pod 'SDWebImage', '~> 4.0'
 ```
 
-##### Swift
+##### Swift and static framework
 
-If you are using `Swift`, `Xcode 9+` and `CocoaPods` `1.5.0+`, you only need to set your target to `iOS 8+` if you need static library:
+Swift project previously have to use `use_frameworks!` to make all Pods into dynamic framework to let CocoaPods works.
+
+However, start with `CocoaPods 1.5.0+` (with `Xcode 9+`), which supports to build both Objective-C && Swift code into static framework. You can use modular headers to use SDWebImage as static framework, without the need of `use_frameworks!`:
 
 ```
 platform :ios, '8.0'
+# Uncomment the next line when you want Pods as static framework
+# use_modular_headers!
+pod 'SDWebImage', :modular_headers => true
 ```
 
-If not, you still need to add `use_frameworks!` to use dynamic framework:
+See more on [CocoaPods 1.5.0 — Swift Static Libraries](http://blog.cocoapods.org/CocoaPods-1.5.0/)
+
+If not, you still need to add `use_frameworks!` to use SDWebImage as dynamic framework:
 
 ```
 platform :ios, '8.0'
 use_frameworks!
+pod 'SDWebImage'
 ```
 
 #### Subspecs
@@ -184,3 +192,5 @@ All source code is licensed under the [MIT License](https://raw.github.com/SDWeb
 <p align="center">
     <img src="Docs/SDWebImageSequenceDiagram.png" title="SDWebImage sequence diagram">
 </p>
+
+