Failed to parse JWT - suggested fix

[Malieux]

Hello,
First of all thanks for your work!
When using your module I came across "failed to parse JWT" error multiple times. After digging in it turns out that in Authorization header 'bearer' was not in capital letter. According to standards RFC 7235 Section 2.1 the auth-scheme part of an HTTP Authorization header is case-insensitive.
My quickfix was to change this line to
if (ngx_strncasecmp(jwtHeaderVal->value.data, (u_char *)BEARER_PREFIX, strlen(BEARER_PREFIX)) == 0)
But I'm no C developer so I believe you could fix it in more elegant way.
Thanks in advance.

[JoshMcCullough]

Thanks for this! PR is here, using your fix exactly as you have it (plus some other unrelated fixes).

[JoshMcCullough]

PR is merged and new release is up!