refactor: check if node via process.versions (#222)

This removes the `process.title` check for node and uses `process.versions` instead, `process.title`
is not really reliable as it can be set by code, for example some CLIs will rename the process,
by using `process.versions.node` we can be more sure that we're in node, unless we're in a runtime
that stubs this.

Looking at the libuv codebase we can see that the `uv_get_process_title`[1] function has an assertion
that the title retrieved is not empty, given that we've only seen this on Windows it's possible there's
some permissions issue or similar that is causing this.

[1] https://github.com/libuv/libuv/blob/47a5c85c4e7c63adc838d8e252fb4859e6cb743d/src/win/util.c#L390-L424

Closes #219

Author: ewanharris

configuration.ts

@@ -171,7 +171,7 @@ export class Configuration {
     const baseOptions = params.baseOptions || {};
     baseOptions.headers = baseOptions.headers || {};
 
-    if (typeof process === "object" && process.title === "node" && !baseOptions.headers["User-Agent"]) {
+    if (typeof process === "object" && process.versions?.node && !baseOptions.headers["User-Agent"]) {
       baseOptions.headers["User-Agent"] = DEFAULT_USER_AGENT;
     }