Fix project version (1.2 -> 1.2.0)

Author: AnthonyMDev

Configuration/Shared/Project-Version.xcconfig

@@ -1 +1 @@
-CURRENT_PROJECT_VERSION = 1.2
+CURRENT_PROJECT_VERSION = 1.2.0

Sources/CodegenCLI/Constants.swift

@@ -1,6 +1,6 @@
 import Foundation
 
 public enum Constants {
-  public static let CLIVersion: String = "1.2"
+  public static let CLIVersion: String = "1.2.0"
   static let defaultFilePath: String = "./apollo-codegen-config.json"
 }