Squashed 'apollo-ios-codegen/' changes from a55f4d20..c6b4d9fd

c6b4d9fd Release 1.15.1 (#471)

git-subtree-dir: apollo-ios-codegen
git-subtree-split: c6b4d9fde2ee6eddd495b8ce682bafee1360e92e

Sources/CodegenCLI/Constants.swift

@@ -1,6 +1,6 @@
 import Foundation
 
 public enum Constants {
-  public static let CLIVersion: String = "1.15.0"
+  public static let CLIVersion: String = "1.15.1"
   static let defaultFilePath: String = "./apollo-codegen-config.json"
 }