chore: regenerate README (#345)

This PR was generated using Autosynth. 🌈


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

```
2021-02-24 19:38:23,364 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-datastore/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-02-24 19:38:24,926 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/0bc52500-d7bf-4040-a4c4-defc49a553ee/targets

- [ ] To automatically regenerate this PR, check this box.

Author: yoshi-automation

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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-datastore.git",
-        "sha": "381343a9580fe096b06212f38428cc36092db26d"
+        "sha": "1e82a31ff88223bb96b1ddd2b0584461c9113e50"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "2414b817065726eae0bc525346c7e874f969369d"
+        "sha": "79ab0b44a2cc7d803d07c107f9faf07729fc4012"
       }
     }
   ]

README.md

@@ -17,7 +17,7 @@ If you are using Maven with [BOM][libraries-bom], add this to your pom.xml file
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>libraries-bom</artifactId>
-      <version>16.4.0</version>
+      <version>17.0.0</version>
       <type>pom</type>
       <scope>import</scope>
     </dependency>
@@ -45,18 +45,18 @@ If you are using Maven without BOM, add this to your dependencies:
 
 If you are using Gradle 5.x or later, add this to your dependencies
 ```Groovy
-implementation platform('com.google.cloud:libraries-bom:16.4.0')
+implementation platform('com.google.cloud:libraries-bom:17.0.0')
 
 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:1.105.7'
+compile 'com.google.cloud:google-cloud-datastore:1.105.8'
 ```
 
 If you are using SBT, add this to your dependencies
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-datastore" % "1.105.7"
+libraryDependencies += "com.google.cloud" % "google-cloud-datastore" % "1.105.8"
 ```
 
 ## Authentication