Don't run tests in paralell on the JS side

Author: cquiroz

.travis.yml

@@ -33,7 +33,7 @@ env:
   - COURSIER_NO_TERM=1
 
 script:
-  - sbt scalajavatimeJVM/test scalajavatimeJS/test
+  - sbt ++$TRAVIS_SCALA_VERSION scalajavatimeJVM/test scalajavatimeJS/test
   - sbt docs/makeMicrosite
   #- sbt clean coverage test &&
   #  sbt coverageAggregate

build.sbt

@@ -102,6 +102,7 @@ lazy val scalajavatime = crossProject.crossType(CrossType.Full).in(file("."))
         val destinationDir = (sourceManaged in Compile).value
         copyAndReplace(srcDirs, destinationDir)
       }.taskValue,
+    parallelExecution in Test := false,
     libraryDependencies ++= Seq(
       "io.github.cquiroz" %%% "scala-java-locales" % "0.5.0-cldr30"
     )