Add merge implementation (#10)

* Add merge implementation

* Add Merge3 and MergeMany

* Fix receive implementation

* Fix swift-docc doc warning

* Add merge test

* Update RemainingCombineInterface file

* Update README

* Update Merge implementation to fix test case issue

* Fix testNoDemandOnSubscriptionCrashes case

Package.swift

@@ -71,7 +71,7 @@ let package = Package(
             ],
             swiftSettings: [
                 .unsafeFlags(["-enable-testing"]),
-                .define("WASI", .when(platforms: [.wasi]))
+                .define("WASI", .when(platforms: [.wasi])),
             ]
         )
     ],

README.md

@@ -1,5 +1,5 @@
 # OpenCombine
-[![codecov](https://codecov.io/gh/OpenSwiftUIProject/OpenCombine/branch/master/graph/badge.svg)](https://codecov.io/gh/OpenSwiftUIProject/OpenCombine)
+[![codecov](https://codecov.io/gh/OpenSwiftUIProject/OpenCombine/graph/badge.svg?token=BJSI3J7RZQ)](https://codecov.io/gh/OpenSwiftUIProject/OpenCombine)
 ![Language](https://img.shields.io/badge/Swift-5.9-orange.svg)
 
 Open-source implementation of Apple's [Combine](https://developer.apple.com/documentation/combine) framework for processing values over time.

Sources/OpenCombine/Publishers/Publishers.Zip.swift

@@ -3,6 +3,7 @@
 //
 //
 //  Created by Kyle on 2023/7/25.
+//  Audited for Combine 2023
 
 #if canImport(COpenCombineHelpers)
 import COpenCombineHelpers

Sources/OpenCombine/Subscribers/Subscribers.Demand.swift

@@ -468,7 +468,7 @@ extension Subscribers {
 
         /// Creates a demand instance from a decoder.
         ///
-        /// - Parameter decoder: The decoder of a previously-encoded ``Subscribers.Demand``
+        /// - Parameter decoder: The decoder of a previously-encoded ``Subscribers/Demand``
         ///   instance.
         public init(from decoder: Decoder) throws {
             try self.init(rawValue: decoder.singleValueContainer().decode(UInt.self))