Show updating in installing.md, too.
Show updating in installing.md, too.

BanzaiMan/gcsfuse,GoogleCloudPlatform/gcsfuse,jacobsa/timeutil,GoogleCloudPlatform/gcsfuse,BanzaiMan/gcsfuse,jacobsa/ratelimit,mbrukman/gcsfuse,GoogleCloudPlatform/gcsfuse,kahing/gcsfuse