Update build.gradle with a note on shell requirement

As per #246 (comment)

Author: kraenhansen

packages/host/android/build.gradle

@@ -5,7 +5,7 @@ import org.gradle.internal.os.OperatingSystem
 if (!System.getenv("REACT_NATIVE_OVERRIDE_HERMES_DIR")) {
     throw new GradleException([
         "React Native Node-API needs a custom version of Hermes with Node-API enabled.",
-        "Run the following in your terminal, to clone Hermes and instruct React Native to use it:",
+        "Run the following in your Bash- or Zsh-compatible terminal, to clone Hermes and instruct React Native to use it:",
         "",
         "export REACT_NATIVE_OVERRIDE_HERMES_DIR=\$(npx react-native-node-api vendor-hermes --silent --force)",
         "",