build(java): enable snippet-bot (#189)

Source-Author: Jeff Ching <chingor@google.com>
Source-Date: Mon Oct 19 16:13:57 2020 -0700
Source-Repo: googleapis/synthtool
Source-Sha: 5a506ec8765cc04f7e29f888b8e9b257d9a7ae11
Source-Link: googleapis/synthtool@5a506ec

synth.metadata

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-shared-dependencies.git",
-        "sha": "1cfb2ae542c93257f0d1b58f2dc9fed22fdfb9f8"
+        "sha": "ce7c571dee5350d3bb01838c0d76677551d7a658"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "7c5370937dd9ba9dcf9cd7d2af880a58b389b4f1"
+        "sha": "5a506ec8765cc04f7e29f888b8e9b257d9a7ae11"
       }
     }
   ],
@@ -22,6 +22,7 @@
     ".github/ISSUE_TEMPLATE/support_request.md",
     ".github/PULL_REQUEST_TEMPLATE.md",
     ".github/readme/synth.py",
+    ".github/snippet-bot.yml",
     ".github/trusted-contribution.yml",
     ".github/workflows/approve-readme.yaml",
     ".github/workflows/auto-release.yaml",