Add Gitlab CI pipeline configuration

.gitlab-ci.yml

+image: hseeberger/scala-sbt:8u181_2.12.6_1.2.1
+
+variables:
+  SBT_OPTS: "-Dsbt.global.base=sbt-cache/sbtboot -Dsbt.boot.directory=sbt-cache/boot -Dsbt.ivy.home=sbt-cache/ivy"
+
+cache:
+  untracked: true
+  paths:
+    - "sbt-cache/ivy/cache"
+    - "sbt-cache/boot"
+    - "sbt-cache/sbtboot"
+    - "sbt-cache/target"
+
+test:
+  script:
+    - sbt clean coverage test coverageReport
+  coverage: '/Coverage was \[\d+.\d+\%\]/'

build.sbt

@@ -2,7 +2,7 @@ lazy val root = (project in file(".")).
   settings(
     inThisBuild(List(
       organization := "pl.edu.agh.kis.eis",
-      scalaVersion := "2.12.5",
+      scalaVersion := "2.12.6",
       version      := "0.1.0-SNAPSHOT"
     )),
     name := "Neighborhood Description Language",

project/build.properties

-sbt.version=1.1.1
+sbt.version=1.2.1

project/plugins.sbt

+addSbtPlugin("org.scoverage" % "sbt-scoverage" % "1.5.1")