URL parameters do not use "string" but "object" notation

[wilkohein]

Function call for REST URL like "/foo/{foo}" are documented as "client.foo({foo})" - which I would interpret as String value for the parameter.

Implementation shows a wrapper object is assumed:
client.foo({foo : "value"})
to add the value to URL (via "template" function).

2 Options:

• Improve readme.MD and stick to object - though I believe this is not common-sense as URLs only support plain text strings
• Do not use "template" but directly use provided value.