chore: regenerate README (#221)

This PR was generated using Autosynth. 🌈


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

```
2021-01-11 19:39:38,116 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-grafeas/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-01-11 19:39:39,041 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/f067be43-1f97-4ff4-9b50-0d210f25b970/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-grafeas.git",
-        "sha": "e2741d8ca13099d7e0a5b5d57505e0cead5cab9d"
+        "sha": "c16417c1a4bd8f8f5658efb2f815c5d991df8cd8"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "996775eca5fd934edac3c2ae34b80ff0395b1717"
+        "sha": "16ec872dd898d7de6e1822badfac32484b5d9031"
       }
     }
   ]

README.md

@@ -21,10 +21,11 @@ If you are using Maven, add this to your pom.xml file:
 </dependency>
 ```
 
-If you are using Gradle, add this to your dependencies
+If you are using Gradle without BOM, add this to your dependencies
 ```Groovy
 compile 'io.grafeas:grafeas:1.0.5'
 ```
+
 If you are using SBT, add this to your dependencies
 ```Scala
 libraryDependencies += "io.grafeas" % "grafeas" % "1.0.5"