Update version number in readme

README.md

@@ -17,7 +17,7 @@ To read the value from an environment variable named `MY_TOKEN` when the plugin
 steps:
   - command: yarn install
     plugins:
-      - seek-oss/private-npm#v1.1.2:
+      - seek-oss/private-npm#v1.2.0:
           env: "MY_TOKEN"
 ```
 
@@ -27,7 +27,7 @@ To read the value from a file named `my_token_file`, use the `file` field.
 steps:
   - command: yarn install
     plugins:
-      - seek-oss/private-npm#v1.1.2:
+      - seek-oss/private-npm#v1.2.0:
           file: "my_token_file"
 ```
 
@@ -39,7 +39,7 @@ approach is discoraged in favour of using with the `env` or `file` fields.  This
 steps:
   - command: yarn install
     plugins:
-      - seek-oss/private-npm#v1.1.2:
+      - seek-oss/private-npm#v1.2.0:
           token: ${MY_TOKEN}
 ```
 
@@ -50,7 +50,7 @@ You can also specify a custom npm registry if you are using your own mirror.
 steps:
   - command: yarn install
     plugins:
-      - seek-oss/private-npm#v1.1.2:
+      - seek-oss/private-npm#v1.2.0:
           env: "MY_TOKEN"
           registry: //myprivatenpm.com/
 ```