Make the README example code more portable

Also, the `$HOME` variable can be modified while `os.path.expanduser()` does the right thing.

This works on windows as well whereas the previous code did not.

Author: SEJeff

README.md

@@ -31,7 +31,7 @@ import os
 from kubernetes import client, config
 
 # Configs can be set in Configuration class directly or using helper utility
-config.load_kube_config(os.environ["HOME"] + '/.kube/config')
+config.load_kube_config(os.path.join(os.path.expanduser('~'), '.kube', 'config')
 
 v1=client.CoreV1Api()
 print("Listing pods with their IPs:")
@@ -48,7 +48,7 @@ import os
 from kubernetes import client, config, watch
 
 # Configs can be set in Configuration class directly or using helper utility
-config.load_kube_config(os.environ["HOME"] + '/.kube/config')
+config.load_kube_config(os.path.join(os.path.expanduser('~'), '.kube', 'config')
 
 v1 = client.CoreV1Api()
 count = 10