Fix Travis ordering (from running ./update.sh)

Author: tianon

.travis.yml

@@ -2,12 +2,12 @@ language: bash
 services: docker
 
 env:
-  - VERSION=8.3 VARIANT=apache
-  - VERSION=8.3 VARIANT=fpm
-  - VERSION=8.3 VARIANT=fpm-alpine
   - VERSION=8.4-rc VARIANT=apache
   - VERSION=8.4-rc VARIANT=fpm
   - VERSION=8.4-rc VARIANT=fpm-alpine
+  - VERSION=8.3 VARIANT=apache
+  - VERSION=8.3 VARIANT=fpm
+  - VERSION=8.3 VARIANT=fpm-alpine
   - VERSION=7 VARIANT=apache
   - VERSION=7 VARIANT=fpm
   - VERSION=7 VARIANT=fpm-alpine