Merge ~tshinn/snap-store-proxy-charm:readme_registration_bundle into snap-store-proxy-charm:master

[Tong Shinn]

Update README to be more clear on how registration_bundle works.

[William Grant (wgrant)]

review: Approve (code)

diff --git a/README.md b/README.md
index 2e2d77c..3ee0ad3 100644
--- a/README.md
+++ b/README.md
@@ -43,9 +43,9 @@ The charm supports the following actions:
 
 There are some mandatory config options that have to be configured for the charm to work, these are:
 
-* **registration_bundle** - A bundle created with a snap called `snapstore-admin`. This tool supports accounts with 2 Factor authentication for Ubuntu One accounts, and contains everything to reproduce the proxy. This is the recommended way to configure the proxy. It is also a required way, if the machine on which the proxy is installed does not have an internet connection to the store. Easiest way to provide this option on the cli is the following:
+* **registration_bundle** - A bundle created with a snap called `store-admin`. The `store-admin` snap is a tool that supports accounts with 2 Factor authentication for Ubuntu One accounts, and contains everything to reproduce the proxy. This is the recommended way to configure the proxy. It is also a required way, if the machine on which the proxy is installed does not have an internet connection to the store. Easiest way to provide this option on the CLI is the following:
 
-      juju config snap-store-proxy registration_bundle=$(cat <path to file created with snapstore-client>)
+      juju config snap-store-proxy registration_bundle=$(cat <path to file created with store-admin register command>)
 
 ## Juju resource usage