chore: regenerate README (#406)

This PR was generated using Autosynth. 🌈


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

```
2021-04-23 21:42:15,609 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-datastore/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-04-23 21:42:16,860 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/0764198c-15bc-42b6-8034-07e8228275b0/targets

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Author: yoshi-automation

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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-datastore.git",
-        "sha": "c6e85eb9e858295b8820c2ea355c67657480cee2"
+        "sha": "c168760909dbfb5d2d6ad176a4822e9a7dcc1d47"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "043cc620d6a6111816d9e09f2a97208565fde958"
+        "sha": "5a6f30b8bb7672cf237c4f75d5aa96bfba170e7f"
       }
     }
   ]

README.md

@@ -51,12 +51,12 @@ compile 'com.google.cloud:google-cloud-datastore'
 ```
 If you are using Gradle without BOM, add this to your dependencies
 ```Groovy
-compile 'com.google.cloud:google-cloud-datastore:1.106.1'
+compile 'com.google.cloud:google-cloud-datastore:1.106.2'
 ```
 
 If you are using SBT, add this to your dependencies
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-datastore" % "1.106.1"
+libraryDependencies += "com.google.cloud" % "google-cloud-datastore" % "1.106.2"
 ```
 
 ## Authentication