Nodejs docs: require for npm should switch on 1.3.0

[markmandel]

Missed a typo, the new code block should show up in 1.3.0 not 1.2.0

[agones-bot]

Build Succeeded 👏

Build Id: 2ab0539b-418b-4d9d-bca9-37d1d4081aec

The following development artifacts have been built, and will exist for the next 30 days:

• image: gcr.io/agones-images/agones-controller:1.3.0-6759065
• image: gcr.io/agones-images/agones-sdk:1.3.0-6759065
• image: gcr.io/agones-images/agones-ping:1.3.0-6759065
• Linux C++ SDK (build): agonessdk-1.3.0-6759065-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.3.0-6759065.zip

A preview of the website (the last 30 builds are retained):

• https://6759065-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/1284/head:pr_1284 && git checkout pr_1284
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.3.0-6759065

[google-oss-robot]

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This pull-request has been approved by: markmandel, pooneh-m

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