Added another CentOS setup instruction
The step "yum update" was missing.
Without it the system won't be able to find the package gcsfuse, because it has yet to initialize the repo.
@@ -80,7 +80,13 @@ for [other distributions](#other-distributions) below.
https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
EOF
-2. Install gcsfuse:
+2. Make the system aware of the new repo:
+
+ sudo yum update
+
+ Be sure to answer "yes" to any questions about adding the GPG signing key.
+
+3. Install gcsfuse:
sudo yum install gcsfuse
