Move main to 1.27.0

The next release will be 1.27.0 and will come off `main`.

Author: thomasvl

Sources/SwiftProtobuf/Version.swift

@@ -17,9 +17,9 @@ import Foundation
 // Expose version information about the library.
 public struct Version {
   /// Major version.
-  public static let major = 2
+  public static let major = 1
   /// Minor version.
-  public static let minor = 0
+  public static let minor = 27
   /// Revision number.
   public static let revision = 0
 

SwiftProtobuf.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name = 'SwiftProtobuf'
-  s.version = '2.0.0'
+  s.version = '1.27.0'
   s.license = { :type => 'Apache 2.0', :file => 'LICENSE.txt' }
   s.summary = 'Swift Protobuf Runtime Library'
   s.homepage = 'https://github.com/apple/swift-protobuf'