update blog/posts and go mod

blog/proto/blog.proto

@@ -1,16 +1,27 @@
 syntax = "proto3";
 
 package blog;
-option go_package = "proto;blog";
 
 import "github.com/micro/services/posts/proto/posts.proto";
 
 service Blog {
+	// Latest returns the latest blog post
 	rpc Latest(LatestRequest) returns (LatestResponse) {}
+	// Posts returns all the posts
+	rpc Posts(PostsRequest) returns (PostsResponse) {};
 }
 
 message LatestRequest {}
 
 message LatestResponse{
 	posts.Post latest = 1;
-}
+}
+
+message PostsRequest {
+	int64 limit = 1;
+	int64 offset = 2;
+}
+
+message PostsResponse {
+	repeated posts.Post posts = 1;
+}