Fix message

ref: https://github.com/helm/helm/pull/4648#discussion_r218229227

Signed-off-by: Yuya Takeyama <sign.of.the.wolf.pentagram@gmail.com>

scripts/get

@@ -151,7 +151,7 @@ installFile() {
     runAsRoot cp "$TILLER_TMP_BIN" "$HELM_INSTALL_DIR"
     echo "$TILLER_NAME installed into $HELM_INSTALL_DIR/$TILLER_NAME"
   else
-    echo "warn: $TILLER_NAME is not included in this version of binary release"
+    echo "info: $TILLER_NAME binary was not found in this release; skipping $TILLER_NAME installation"
   fi
 }