create a matrix for jdk 8 and jdk 11

Author: shroffk

.travis.yml

@@ -1,8 +1,12 @@
 sudo: required
 language: java
 
-jdk: openjdk11
-
+matrix:
+  include:
+    - jdk: openjdk8
+      before_install:
+        - export MVN_OPT='--projects "!gpclient/gpclient-javafx"'
+    - jdk: openjdk11
 env:
   - EPICS_PVA_ADDR_LIST=127.255.255.255