chore: regenerate README (#334)

This PR was generated using Autosynth. 🌈


<details><summary>Log from Synthtool</summary>

```
2020-10-31 08:12:08,048 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-dlp/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working directory clean
2020-10-31 08:12:08,990 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

```
</details>

Full log will be available here:
https://source.cloud.google.com/results/invocations/9267aabe-edcc-4409-8e9f-51faf44f53e4/targets

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.github/readme/synth.metadata/synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-dlp.git",
-        "sha": "ea032173c19046431234d3dfc843b72df00a7e43"
+        "sha": "a174c4a2ff4a7ae1f1c473dcce4b88f3b5918552"
       }
     },
     {

README.md

@@ -46,11 +46,11 @@ If you are using Maven without BOM, add this to your dependencies:
 
 If you are using Gradle, add this to your dependencies
 ```Groovy
-compile 'com.google.cloud:google-cloud-dlp:2.1.0'
+compile 'com.google.cloud:google-cloud-dlp:2.2.0'
 ```
 If you are using SBT, add this to your dependencies
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-dlp" % "2.1.0"
+libraryDependencies += "com.google.cloud" % "google-cloud-dlp" % "2.2.0"
 ```
 
 ## Authentication