Remove a requirement that apiVersion be present in the config.

Author: brendanburns

src/config.ts

@@ -157,9 +157,6 @@ export class KubeConfig {
 
     public loadFromString(config: string) {
         const obj = yaml.safeLoad(config) as any;
-        if (obj.apiVersion !== 'v1') {
-            throw new TypeError('unknown version: ' + obj.apiVersion);
-        }
         this.clusters = newClusters(obj.clusters);
         this.contexts = newContexts(obj.contexts);
         this.users = newUsers(obj.users);