added Promises.wait

Author: tib

Promises.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
     s.name             = 'Promises'
-    s.version          = '1.0.0'
+    s.version          = '1.0.1'
     s.summary          = 'I promise the future!'
     s.description      = <<-DESC
                             It's just another Promise library that works on

README.md

@@ -13,12 +13,12 @@ pod 'Promises'
 
 ### SPM
 ```
-.package(url: "https://github.com/CoreKit/Promises.git", from: "1.0.0"),
+.package(url: "https://github.com/CoreKit/Promises.git", from: "1.0.1"),
 ```
 
 ### Carthage
 ```
-github "CoreKit/Promises" "1.0.0"
+github "CoreKit/Promises" "1.0.1"
 ```
 
 ## Pod cheatsheet

Sources/Promises.swift

@@ -352,7 +352,24 @@ public enum Promises {
             }
         }
     }
-    
+
+    @discardableResult
+    public static func wait<T>(_ promises: [Promise<T>]) -> Promise<Void> {
+        return Promise<Void> { fulfill, _ in
+            guard !promises.isEmpty else {
+                return fulfill(())
+            }
+            let complete: ((Any) -> Void) = { _ in
+                if !promises.contains(where: { $0.isPending }) {
+                    fulfill(())
+                }
+            }
+            for promise in promises {
+                promise.then(success: complete, failure: complete)
+            }
+        }
+    }
+
     @discardableResult
     public static func race<T>(_ promises: [Promise<T>]) -> Promise<T> {
         return Promise<T> { fulfill, reject in