fix(auth/client): fixes persistent error ref

apprently axios does some header swapping from headers.common to headers. which will essentially
persist the token indefinitely. This commit has some self-defense character, hence we should review
this at a later time

src/client.ts

@@ -5,7 +5,9 @@ import { environment } from './environment'
 export interface ClientOptions {
   base?: string
   timeout?: number
-  headers?: object
+  headers?: {
+    [key: string]: any;
+  }
   token?: string
 }
 
@@ -67,6 +69,8 @@ export class Client {
   }
 
   clearDefaults(): void {
+    Client.instance.axiosInstance.defaults.headers.common['Authorization'] = undefined
+    Client.instance.axiosInstance.defaults.headers['Authorization'] = undefined
     Client.instance.axiosInstance.defaults.headers.common = {
       ...defaultHeaders
     }

src/tillhub-js.ts

@@ -105,6 +105,10 @@ export class TillhubClient extends events.EventEmitter {
         headers: {}
       }
 
+      if ((options.credentials as TokenAuth).token && clientOptions.headers) {
+        clientOptions.headers['Authorization'] = `Bearer ${(options.credentials as TokenAuth).token}`
+      }
+
       this.auth = new v1.Auth(authOptions)
       this.http = Client.getInstance(clientOptions).setDefaults(clientOptions)
       return true