Add empty lines strategically to keep wonky parser happy

#775 (comment)
Per @carl-mastrangelo:
> Add a new line between the ---, since the GitHub MD parser
> is wonky.

Author: kkm

_posts/2018-06-19-kotlin-project-setup.md

@@ -8,6 +8,7 @@ author-link: https://github.com/zpencer
 company: Google
 company-link: https://www.google.com
 ---
+
 Did you know that gRPC Java now has out of box support for Kotlin projects built with Gradle? [Kotlin](https://kotlinlang.org/) is a modern, statically typed language developed by JetBrains that targets the JVM and Android. It is generally easy for Kotlin programs to interoperate with existing Java libraries. To improve this experience further, we have added support to the [protobuf-gradle-plugin](https://github.com/google/protobuf-gradle-plugin/releases) so that the generated Java libraries are automatically picked up by Kotlin. You can now add the protobuf-gradle-plugin to your Kotlin project, and use gRPC just like you would with a typical Java project.
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 The following examples show you how to configure a project for a JVM application and an Android application using Kotlin.

_posts/2018-07-13-http2_smarter_at_scale.md

@@ -8,6 +8,7 @@ author-link: https://github.com/jadekler
 company: Google
 company-link: https://www.google.com
 ---
+
 Much of the web today runs on HTTP/1.1. The spec for HTTP/1.1 was published in June of 1999, just shy of 20 years ago. A lot has changed since then, which makes it all the more remarkable that HTTP/1.1 has persisted and flourished for so long. But in some areas it’s beginning to show its age; for the most part, in that the designers weren’t building for the scale at which HTTP/1.1 would be used and the astonishing amount of traffic that it would come to handle. A not-so-bad case is that subsequent tests can't pass because of a leaked resource from the previous test. The worst case is that some subsequent tests pass that wouldn't have passed at all if the previously passed test had not leaked a resource.
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_posts/2018-08-20-grpc-on-http2.md

@@ -8,6 +8,7 @@ author-link: https://github.com/jadekler
 company: Google
 company-link: https://www.google.com
 ---
+
 In a [previous article](https://grpc.io/blog/http2_smarter_at_scale), we explored how HTTP/2 dramatically increases network efficiency and enables real-time communication by providing a framework for long-lived connections. In this article, we’ll look at how gRPC builds on HTTP/2’s long-lived connections to create a performant, robust platform for inter-service communication. We will explore the relationship between gRPC and HTTP/2, how gRPC manages HTTP/2 connections, and how gRPC uses HTTP/2 to keep connections alive, healthy, and utilized.
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