Add missing import for swift build

Add action workflow to SwiftPM CI

.github/workflows/build.yml

@@ -0,0 +1,18 @@
+name: Build
+on: push
+jobs:
+  build:
+    name: build
+    runs-on: macOS-10.14
+    env:
+        DEVELOPER_DIR: /Applications/Xcode_11.1.app/Contents/Developer
+    steps:
+      - name: Checkout
+        uses: actions/checkout@master
+        with:
+          fetch-depth: 1
+      - name: Swift build
+        run: |
+          sdk=`xcrun -sdk iphonesimulator -show-sdk-path`
+          sdkVersion=`echo $sdk | sed -E 's/.*iPhoneSimulator(.*)\.sdk/\1/'`
+          swift build  -Xswiftc "-sdk" -Xswiftc "$sdk" -Xswiftc "-target" -Xswiftc "x86_64-apple-ios$sdkVersion-simulator"

.github/workflows/lint.yml

@@ -0,0 +1,19 @@
+name: Lint
+on: push
+jobs:
+  lint:
+    name: Lint
+    runs-on: macOS-10.14
+    steps:
+      - name: Checkout
+        uses: actions/checkout@master
+        with:
+          fetch-depth: 1
+      - name: Install swiftlint
+        run: |
+          brew install swiftlint
+        env:
+          HOMEBREW_NO_INSTALL_CLEANUP: 1
+      - name: Code Lint
+        run: |
+          swiftlint --strict

.github/workflows/test.yml

@@ -0,0 +1,18 @@
+name: Test
+on: push
+jobs:
+  build:
+    name: test
+    runs-on: macOS-10.14
+    env:
+        DEVELOPER_DIR: /Applications/Xcode_11.1.app/Contents/Developer
+    steps:
+      - name: Checkout
+        uses: actions/checkout@master
+        with:
+          fetch-depth: 1
+      - name: Swift test
+        run: |
+          sdk=`xcrun -sdk iphonesimulator -show-sdk-path`
+          sdkVersion=`echo $sdk | sed -E 's/.*iPhoneSimulator(.*)\.sdk/\1/'`
+          swift test  -Xswiftc "-sdk" -Xswiftc "$sdk" -Xswiftc "-target" -Xswiftc "x86_64-apple-ios$sdkVersion-simulator"

Sources/Handler/OAuthSwiftOpenURLExternally.swift

@@ -8,6 +8,14 @@
 
 import Foundation
 
+#if os(iOS) || os(tvOS)
+import UIKit
+#elseif os(watchOS)
+import WatchKit
+#elseif os(OSX)
+import AppKit
+#endif
+
 /// Open externally using open url application function.
 open class OAuthSwiftOpenURLExternally: OAuthSwiftURLHandlerType {