fix missing GroupWork.h warning (#9)

Author: quanvo87

GroupWork.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name         = "GroupWork"
-  s.version      = "0.0.4"
+  s.version      = "0.0.5"
   s.summary      = "Swift module that helps with running multiple, concurrent, asynchronous tasks in a clean way."
   s.description  = "Swift module that helps with running multiple, concurrent, asynchronous tasks in a clean way. Better description inc."
   s.homepage     = "https://github.com/quanvo87/GroupWork"
@@ -9,5 +9,5 @@ Pod::Spec.new do |s|
                      "Wilson Ding" => "hello@wilsonding.com" }
   s.platform     = :ios, "8.0"
   s.source       = { :git => "https://github.com/quanvo87/GroupWork.git", :tag => s.version }
-  s.source_files  = "Sources/GroupWork/*.swift"
+  s.source_files  = "Sources/GroupWork/*.{h,m,swift}"
 end

README.md

@@ -50,7 +50,7 @@ github "quanvo87/GroupWork"
 For [SPM](https://swift.org/package-manager/), add to your package dependencies:
 
 ```
-.package(url: "https://github.com/quanvo87/GroupWork.git", .upToNextMinor(from: "0.0.0")),
+.package(url: "https://github.com/quanvo87/GroupWork.git", .upToNextMinor(from: "0.0.0"))
 ```
 
 #### Manually
@@ -128,7 +128,7 @@ Now you can create a `GroupWork`, and call `work.simpleFuncA()` on it like in th
 
 notes:
   - `start()` must be called before an asynchronous task
-  - `finish()` must be called in the completion handler of an asynchronous
+  - `finish()` must be called in the completion handler of an asynchronous task
   - `start()` and `finish()` calls must be balanced
 
 ## Working Example