check that Linux output doesn't contain any junk

.travis.yml

@@ -7,7 +7,7 @@ scala: 2.10.7
 
 env:
   global:
-    - SBT_VER=1.3.0-M4
+    - SBT_VER=1.3.0
     - TRAVIS_JDK=adopt@1.8.212-04
     - JABBA_HOME=$HOME/.jabba
     - TRAVIS_JDK11=openjdk@1.11.0

citest/build.sbt

@@ -18,12 +18,5 @@ lazy val root = (project in file("."))
       val ys = IO.readLines(file("err.txt")).toVector.distinct
 
       assert(ys.isEmpty, s"there's an stderr: $ys")
-    },
-
-    check2 := {
-      val xs = IO.readLines(file("output.txt")).toVector
-      println(xs)
-      val ys = IO.readLines(file("err.txt")).toVector.distinct
-      assert(!ys.exists(_.contains("Ignoring option MaxPermSize; support was removed in 8.0")), s"there's an stderr: $ys")
     }
   )

citest/test.sh

@@ -15,7 +15,7 @@ unzip -qo ../target/universal/sbt.zip -d ./freshly-baked
 
 ./freshly-baked/sbt/bin/sbt -Dsbt.no.format=true about
 ./freshly-baked/sbt/bin/sbt -Dsbt.no.format=true about 1> output.txt 2> err.txt
-./freshly-baked/sbt/bin/sbt check2
+./freshly-baked/sbt/bin/sbt check
 
 ./freshly-baked/sbt/bin/sbt about run -v