chore: update CONTRIBUTING.md to include code formatting (#140)

This PR was generated using Autosynth. 🌈 Synth log will be available here: https://source.cloud.google.com/results/invocations/0ba8d2f8-7f35-417b-8c9a-d829ca01eac0/targets Source-Link: googleapis/synthtool@5b48b07
googleapis · May 18, 2020 · 3f09d95 · 3f09d95
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diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -99,7 +99,16 @@ mvn -Penable-samples clean verify
     ```
 
 2. [Activate](#profile-activation) the profile.
-3. Define your samples in a normal Maven project in the `samples/` directory
+3. Define your samples in a normal Maven project in the `samples/` directory.
+
+### Code Formatting
+
+Code in this repo is formatted with
+[google-java-format](https://github.com/google/google-java-format).
+To run formatting on your project, you can run:
+```
+mvn com.coveo:fmt-maven-plugin:format
+```
 
 ### Profile Activation
 

diff --git a/synth.metadata b/synth.metadata
@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-errorreporting.git",
-        "sha": "7278629514fe46c820c88f6b20dd8f533dd8d296"
+        "sha": "642e04e1020dec383ca686c732956e55bd4b8461"
       }
     },
     {
@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "98c50772ec23295c64cf0d2ddf199ea52961fd4c"
+        "sha": "5b48b0716a36ca069db3038da7e205c87a22ed19"
       }
     }
   ],