Nytimes/drone-gke Missing required param: token

Hi All,

After upgrade drone to 1.0.0-rc2, encountered an error as title.[Missing required param: token]
Same code is work at drone:0.8.

Here is my part of yaml:
deployProd:
image: nytimes/drone-gke
zone: xxx
cluster: xxx
expand_env_vars: true
vars:
image: xxx
app: xxx
env: prod
user: $${USER}
secrets:
- source: google_credentials
target: token

I change “token” to uppercase, it works…
It seems drone:1.0.0 is case sensitive.
Because lowercase “token” works at drone:0.8 with same version plugin.
Part of source code in nytimes/drone-gke:
cli.StringFlag{
Name: “token”,
Usage: “service account’s JSON credentials”,
EnvVar: “TOKEN”,
}

Here is my final code:
deployProd:
image: nytimes/drone-gke
zone: xxx
cluster: xxx
expand_env_vars: true
vars:
image: xxx
app: xxx
env: prod
user: $${USER}
secrets:
- source: google_credentials
target: TOKEN