chore: regenerate README (#432)

This PR was generated using Autosynth. 🌈


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

```
2021-02-12 01:36:20,451 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-storage-nio/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-02-12 01:36:21,980 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/9727a9c2-1f7d-4902-a12b-d896c79f0445/targets

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

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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-storage-nio.git",
-        "sha": "3a3d46599b463801714cc415c0e49e112f8d8838"
+        "sha": "a1f058e44b93abedc5ef7f5767e95b81b58cc2c9"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "4679e7e415221f03ff2a71e3ffad75b9ec41d87e"
+        "sha": "b32c87d2c087fb2a841acc623ab540105de821af"
       }
     }
   ]

README.md

@@ -42,7 +42,7 @@ If you are using Maven without BOM, add this to your dependencies:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-nio</artifactId>
-  <version>0.122.4</version>
+  <version>0.122.5</version>
 </dependency>
 
 ```