verifyToken is not a function

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Same issue as found in #49

Having the same issue. I'm using the code examples section found on the template I created (i.e. postmark.sendEmailWithTemplate).

root@vps102313:~# node --version
v9.7.1

Ubuntu 16

/root/acorn-autoclaim/node_modules/postmark/dist/client/BaseClient.js:22
this.verifyToken(token);
^

TypeError: this.verifyToken is not a function
at Object.BaseClient (/root/acorn-autoclaim/node_modules/postmark/dist/client/BaseClient.js:22:14)
at Object.ServerClient (/root/acorn-autoclaim/node_modules/postmark/dist/client/ServerClient.js:28:23)
at Object. (/root/acorn-autoclaim/index.js:6:42)
at Module._compile (module.js:662:30)
at Object.Module._extensions..js (module.js:673:10)
at Module.load (module.js:575:32)
at tryModuleLoad (module.js:515:12)
at Function.Module._load (module.js:507:3)
at Function.Module.runMain (module.js:703:10)
at startup (bootstrap_node.js:193:16)

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Fixed it. I was using new require("postmark").ServerClient("api key") as a shortcut. Splitting the require worked.