Updating README.md to say Gizmo is in maint. mode (#639)

* updating readme to say gizmo is in maintenance mode

README.md

@@ -1,5 +1,9 @@
 # Gizmo Microservice Toolkit [![GoDoc](https://godoc.org/github.com/NYTimes/gizmo?status.svg)](https://godoc.org/github.com/NYTimes/gizmo) [![Build Status](https://travis-ci.org/nytimes/gizmo.svg?branch=master)](https://travis-ci.org/nytimes/gizmo) [![Coverage Status](https://coveralls.io/repos/nytimes/gizmo/badge.svg?branch=master&service=github)](https://coveralls.io/github/nytimes/gizmo?branch=master)
 
+<p align="center" style="font-size:x-large;">
+  <B><I>As of late April, 2021 Gizmo has been placed in maintenance mode.</I></B>
+</p>
+
 <p align="center">
   <img src="http://graphics8.nytimes.com/images/blogs/open/2015/gizmo.png"/>
 </p>

examples/go.mod

@@ -3,22 +3,22 @@ module github.com/NYTimes/gizmo/examples
 replace github.com/NYTimes/gizmo => ../
 
 require (
-	cloud.google.com/go v0.38.0
+	cloud.google.com/go v0.57.0
 	github.com/NYTimes/gizmo v1.2.1
 	github.com/NYTimes/gziphandler v1.1.0
 	github.com/NYTimes/logrotate v1.0.0
 	github.com/NYTimes/sqliface v0.0.0-20180310195202-f8e6c8b78d37
 	github.com/go-kit/kit v0.9.0
-	github.com/go-sql-driver/mysql v1.4.1
-	github.com/golang/protobuf v1.3.2
+	github.com/go-sql-driver/mysql v1.5.0
+	github.com/golang/protobuf v1.4.2
 	github.com/gorilla/context v1.1.1
 	github.com/gorilla/websocket v1.4.0
-	github.com/kelseyhightower/envconfig v1.3.0
-	github.com/pkg/errors v0.8.1
-	github.com/sirupsen/logrus v1.3.0
-	golang.org/x/net v0.0.0-20190628185345-da137c7871d7
-	google.golang.org/genproto v0.0.0-20190716160619-c506a9f90610
-	google.golang.org/grpc v1.22.0
+	github.com/kelseyhightower/envconfig v1.4.0
+	github.com/pkg/errors v0.9.1
+	github.com/sirupsen/logrus v1.6.0
+	golang.org/x/net v0.0.0-20200501053045-e0ff5e5a1de5
+	google.golang.org/genproto v0.0.0-20200430143042-b979b6f78d84
+	google.golang.org/grpc v1.29.1
 )
 
 go 1.13