Cleanup in changelog, GitHub CI config + manifest

Author: Jeehut

.github/workflows/main.yml

@@ -27,7 +27,7 @@ jobs:
         run: swift test -v
 
   test-macos:
-    runs-on: macOS-latest
+    runs-on: macos-11
 
     steps:
       - uses: actions/checkout@v2

CHANGELOG.md

@@ -7,7 +7,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) a
 ### Added
 - None.
 ### Changed
-- Allowed to change the baseUrl.
+- Made the `baseUrl` parameter of `ApiProvider` editable.
 ### Deprecated
 - None.
 ### Removed

Package.swift

@@ -3,7 +3,7 @@ import PackageDescription
 
 let package = Package(
   name: "Microya",
-  platforms: [.macOS(.v10_15), .iOS(.v13), .tvOS(.v13)],
+  platforms: [.macOS(.v10_15), .iOS(.v13), .tvOS(.v13), .watchOS(.v6)],
   products: [
     .library(name: "Microya", targets: ["Microya"])
   ],