Add constant for package name

Author: emrepun

Package.swift

@@ -1,10 +1,12 @@
 // swift-tools-version:5.1
 import PackageDescription
 
-let package = Package(name: "StickyTabBarViewController",
+let packageName = "StickyTabBarViewController"
+
+let package = Package(name: packageName,
                       platforms: [.iOS(.v10)],
-                      products: [.library(name: "StickyTabBarViewController",
-                                          targets: ["StickyTabBarViewController"])],
-                      targets: [.target(name: "StickyTabBarViewController",
-                                        path: "StickyTabBarViewController/Classes")],
+                      products: [.library(name: packageName,
+                                          targets: [packageName])],
+                      targets: [.target(name: packageName,
+                                        path: "\(packageName)/Classes")],
                       swiftLanguageVersions: [.v5])