params with upper-case characters

[Intelligent2013]

Looks like the parameters with upper-case characters don't recognition with 'isset' function.

For example, config.toml has parameter
googleAnalytics = "UA-12345678-123"
But I get the message 'You must set a googleAnalytics UA-Code within the global config.toml Params.' on the page.

I've made a changes in the file themes\gohugo-amp\layouts\partials\amp\google-analytics.html:
from
{{ if isset $.Site.Params "googleAnalytics" }}
to
{{ if isset $.Site.Params "googleanalytics" }}
and everything is working now.

But the strings:
{{ printf "%s" $.Site.Params.googleAnalytics }}
{{ printf "%s" $.Site.Params.googleanalytics }}
work both.

The same problem in the file 'app-banner-header.html' and others.

[wildhaber]

@Intelligent2013 thanks for reporting this issue.

It should be fixed in the current branch develop. I'll make a versioned update in master as soon as its tested.

Related PR: #23