Fix Travis build for OpenJDK 7

plamentotev · web-flow · commit 708733c1b300 · 2019-07-27T18:30:47.000+03:00
Travis updated their default Linux distribution to Xenial.
That brakes the OpenJDK 7 build. Explicitly set the distribution to Trusty
to fix the build until better solution is found.
diff --git a/.travis.yml b/.travis.yml
@@ -6,6 +6,8 @@ jdk:
   - openjdk10
   - openjdk11
 
+dist: trusty
+
 # No need for preliminary install step.
 install: true
 #

Original file line number	Diff line number	Diff line change
`@@ -6,6 +6,8 @@ jdk:`
`6`	`6`	`- openjdk10`
`7`	`7`	`- openjdk11`
`8`	`8`
	`9`	`+dist: trusty`
	`10`	`+`
`9`	`11`	`# No need for preliminary install step.`
`10`	`12`	`install: true`
`11`	`13`	`#`