Currently, Helm v2.5.1 is used, but this version is released in 2017
and a little outdated.
To use the latest version of helm v2.x.x would be beneficial
as we can use more useful Helm commands like `helm template`.
This commit updates Helm version and stop using `helm lint`
with `--strict` option because Helm v2.16.7 does not allow
to use undefined values in values.yaml and
the Helm upstream is now stopping using the `--strict` option.
Signed-off-by: binoue <banji-inoue@cybozu.co.jp>
binoue
a86b060849