drop php 7.3 build (composer moaning); change travis badge to 3.2 branch in README.md

.travis.yml

@@ -3,7 +3,6 @@ php:
   - 7.0
   - 7.1
   - 7.2
-  - 7.3
 
 cache:
   directories:

README.md

@@ -1,4 +1,4 @@
-postfixadmin [![Build Status](https://travis-ci.org/postfixadmin/postfixadmin.svg?branch=master)](https://travis-ci.org/postfixadmin/postfixadmin)
+postfixadmin [![Build Status](https://travis-ci.org/postfixadmin/postfixadmin.svg?branch=postfixadmin_3.2)](https://travis-ci.org/postfixadmin/postfixadmin)
 [![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/postfixadmin/Lobby)
 
 ============