Disable trusty/Spigot target

As of 1.12, Spigot requires Java 8. Trusty only offers Java 8 through a PPA.

Author: benwebber

.travis.yml

@@ -15,7 +15,6 @@ env:
     - OS=centos7  SERVER=minecraft PROCESS_CONTROL=systemd
     - OS=jessie64 SERVER=spigot    PROCESS_CONTROL=systemd
     - OS=jessie64 SERVER=spigot    PROCESS_CONTROL=supervisor
-    - OS=trusty64 SERVER=spigot    PROCESS_CONTROL=supervisor
     - OS=xenial64 SERVER=spigot    PROCESS_CONTROL=systemd
     - OS=centos7  SERVER=spigot    PROCESS_CONTROL=systemd
 before_install: