Version bump for a release.

Sources/SwiftProtobuf/Version.swift

@@ -21,7 +21,7 @@ public struct Version {
     /// Minor version.
     public static let minor = 28
     /// Revision number.
-    public static let revision = 1
+    public static let revision = 2
 
     /// String form of the version number.
     public static let versionString = "\(major).\(minor).\(revision)"

SwiftProtobuf.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name = 'SwiftProtobuf'
-  s.version = '1.28.1'
+  s.version = '1.28.2'
   s.license = { :type => 'Apache 2.0', :file => 'LICENSE.txt' }
   s.summary = 'Swift Protobuf Runtime Library'
   s.homepage = 'https://github.com/apple/swift-protobuf'