Bump version to 4.2.0 (#2054)

Package.swift

@@ -3,7 +3,7 @@ import PackageDescription
 
 let package = Package(
   name: "Lottie",
-  // Minimum platform versions should be kept in sync with the per-platform targets in Lottie.xcodeproj
+  // Minimum platform versions should be kept in sync with the per-platform targets in Lottie.xcodeproj and lottie-ios.podspec
   platforms: [.iOS("11.0"), .macOS("10.11"), .tvOS("11.0")],
   products: [.library(name: "Lottie", targets: ["Lottie"])],
   targets: [.target(name: "Lottie", path: "Sources")])

README.md

@@ -41,7 +41,7 @@ To install Lottie using [Swift Package Manager](https://github.com/apple/swift-p
 or you can add the following dependency to your `Package.swift`:
 
 ```swift
-.package(url: "https://github.com/airbnb/lottie-spm.git", from: "4.1.3")
+.package(url: "https://github.com/airbnb/lottie-spm.git", from: "4.2.0")
 ```
 
 When using Swift Package Manager we recommend using the [lottie-spm](https://github.com/airbnb/lottie-spm) repo instead of the main lottie-ios repo.  The main git repository for [lottie-ios](https://github.com/airbnb/lottie-ios) is somewhat large (300+ MB), and Swift Package Manager always downloads the full repository with all git history. The [lottie-spm](https://github.com/airbnb/lottie-spm) repo is much smaller (less than 500kb), so can be downloaded much more quickly. 

lottie-ios.podspec

@@ -8,7 +8,7 @@
 
 Pod::Spec.new do |s|
   s.name             = 'lottie-ios'
-  s.version          = '4.1.3'
+  s.version          = '4.2.0'
   s.summary          = 'A library to render native animations from bodymovin json'
 
   s.description = <<-DESC

package.json

@@ -1,6 +1,6 @@
 {
   "name": "lottie-ios",
-  "version": "4.1.3",
+  "version": "4.2.0",
   "description": "Lottie is a mobile library for Android and iOS that parses Adobe After Effects animations exported as json with bodymovin and renders the vector animations natively on mobile and through React Native!",
   "main": "index.js",
   "scripts": {