Fix example in README.md

Signed-off-by: Mikkel Oscar Lyderik Larsen <mikkel.larsen@zalando.de>

Author: mikkeloscar

README.md

@@ -25,7 +25,7 @@ metadata:
     heritage: pdb-controller
     version: v1.0.0
 spec:
-  minAvailable: 1
+  maxUnavailable: 1
   selector:
     matchLabels:
       application: my-app
@@ -56,7 +56,6 @@ support](https://github.com/golang/go/wiki/Modules#installing-and-activating-mod
 Assuming Go has been setup with module support it can be built simply by running:
 
 ```sh
-export GO111MODULE=on # needed if the project is checked out in your $GOPATH.
 $ make
 ```