Update README.md re: issues w/ Java 10 and 11
Addresses
@@ -8,7 +8,7 @@ Anserini is an open-source information retrieval toolkit built on Lucene that ai
## Getting Started
-Build using Maven:
+Anserini requires Java 8 (note that there are [known issues with Java 10 and Java 11](https://github.com/castorini/Anserini/issues/445)) and Maven 3.3+. Build using Maven:
```
mvn clean package appassembler:assemble
