Run apt-key add for bazel as root

The command needs to be run as root.

Signed-off-by: milind <milind.upadhyay@gmail.com>
Change-Id: Iaa0f76b7d225817706e16c6cea980b956ceec01b
diff --git a/README.md b/README.md
index bcfe5c6..839f9c8 100644
--- a/README.md
+++ b/README.md
@@ -77,7 +77,7 @@
         1. Step 1: Add Bazel distribution URI as a package source
            ```
            sudo apt install curl
-           curl -fsSL https://bazel.build/bazel-release.pub.gpg | apt-key add -
+           curl -fsSL https://bazel.build/bazel-release.pub.gpg | sudo apt-key add -
            echo "deb [arch=amd64] https://storage.googleapis.com/bazel-apt stable jdk1.8" | sudo tee /etc/apt/sources.list.d/bazel.list
            ```
         2. Step 2: Install Bazel