docs: added Python2 sunset notice (synth) (#140)

* chore: update Py2 support msg to reflect passage of time

Source-Author: Dan O'Meara <danom@google.com>
Source-Date: Mon Jun 29 13:20:01 2020 -0700
Source-Repo: googleapis/synthtool
Source-Sha: 303271797a360f8a439203413f13a160f2f5b3b4
Source-Link: googleapis/synthtool@3032717

docs/_templates/layout.html

@@ -21,8 +21,8 @@
 
           <div class="body" role="main">
           	<div class="admonition" id="python2-eol"> 
-          	 On January 1, 2020 this library will no longer support Python 2 on the latest released version. 
-          	 Previously released library versions will continue to be available. For more information please
+          	 As of January 1, 2020 this library no longer supports Python 2 on the latest released version. 
+          	 Library versions released prior to that date will continue to be available. For more information please
           	 visit <a href="https://cloud.google.com/python/docs/python2-sunset/">Python 2 support on Google Cloud</a>.
           	</div>
             {% block body %} {% endblock %}

synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/python-pubsub.git",
-        "sha": "71d70822c816062ef10d6d7584c4f8ed038d923f"
+        "sha": "e204b86e34346b6d456771ef4d4cfe5e15e53238"
       }
     },
     {
@@ -19,14 +19,21 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "cf2eff09d0f5319a4dc5cdce2b6356d85af4a798"
+        "sha": "303271797a360f8a439203413f13a160f2f5b3b4"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "cf2eff09d0f5319a4dc5cdce2b6356d85af4a798"
+        "sha": "303271797a360f8a439203413f13a160f2f5b3b4"
+      }
+    },
+    {
+      "git": {
+        "name": "synthtool",
+        "remote": "https://github.com/googleapis/synthtool.git",
+        "sha": "303271797a360f8a439203413f13a160f2f5b3b4"
       }
     }
   ],