Update README.md (apache#11275)

Without zip project will not build.
cckellogg · Jul 13, 2021 · be63e87 · be63e87
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commit be63e87
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diff --git a/README.md b/README.md
@@ -88,6 +88,7 @@ components in the Pulsar ecosystem, including connectors, adapters, and other la
 Requirements:
  * Java [JDK 11](https://adoptopenjdk.net/?variant=openjdk11) or [JDK 8](https://adoptopenjdk.net/?variant=openjdk8)
  * Maven 3.6.1+
+ * zip
 
 Compile and install: