chore: regenerate README (#613)

This PR was generated using Autosynth. 🌈


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

```
2021-08-11 20:21:34,898 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-dlp/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-08-11 20:21:36,259 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/499c4292-fe1c-4195-9393-3a5234ccb9fc/targets

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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-dlp.git",
-        "sha": "c52cad143d58cac4d27df11d1583248780efe075"
+        "sha": "2e4d20384ea486ca0121ff631032211563fa5e0e"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "3d32990b6f4b57be77455e3ca89e6e21cd0c06b3"
+        "sha": "7e1f6da50524b5d98eb67adbf6dd0805df54233d"
       }
     }
   ]

README.md

@@ -57,13 +57,13 @@ compile 'com.google.cloud:google-cloud-dlp'
 If you are using Gradle without BOM, add this to your dependencies
 
 ```Groovy
-compile 'com.google.cloud:google-cloud-dlp:2.4.5'
+compile 'com.google.cloud:google-cloud-dlp:2.4.6'
 ```
 
 If you are using SBT, add this to your dependencies
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-dlp" % "2.4.5"
+libraryDependencies += "com.google.cloud" % "google-cloud-dlp" % "2.4.6"
 ```
 
 ## Authentication