Updgrade dependencies

sbt 1.2.6
scala 2.12.7
sbt-release-early 2.1.1

build.sbt

@@ -1,35 +1,37 @@
-lazy val root = (project in file(".")).settings(
-  inThisBuild(
-    Seq(
-      organization := "ph.samson",
-      homepage := Some(url("https://github.com/esamson/sbt-groovy")),
-      licenses := Seq(
-        "MIT" -> url("http://opensource.org/licenses/mit-license.php")),
-      scmInfo := Some(
-        ScmInfo(
-          url("https://github.com/esamson/sbt-groovy"),
-          "scm:git:git@github.com:esamson/sbt-groovy.git"
-        )
-      ),
-      developers := List(
-        Developer(
-          id = "esamson",
-          name = "Edward Samson",
-          email = "edward@samson.ph",
-          url = url("https://edward.samson.ph")
-        )
-      ),
-      scalaVersion := "2.12.4",
-      pgpPublicRing := file("./travis/pubring.asc"),
-      pgpSecretRing := file("./travis/secring.asc"),
-      releaseEarlyWith := SonatypePublisher
-    )),
-  name := "sbt-groovy",
-  sbtPlugin := true,
-  scriptedLaunchOpts ++= Seq(
-    "-Xmx2048M",
-    "-XX:MaxMetaspaceSize=512M",
-    s"-Dplugin.version=${version.value}"
-  ),
-  scriptedBufferLog := false
-)
+lazy val root = (project in file("."))
+  .enablePlugins(SbtPlugin)
+  .settings(
+    inThisBuild(
+      Seq(
+        organization := "ph.samson",
+        homepage := Some(url("https://github.com/esamson/sbt-groovy")),
+        licenses := Seq(
+          "MIT" -> url("http://opensource.org/licenses/mit-license.php")),
+        scmInfo := Some(
+          ScmInfo(
+            url("https://github.com/esamson/sbt-groovy"),
+            "scm:git:git@github.com:esamson/sbt-groovy.git"
+          )
+        ),
+        developers := List(
+          Developer(
+            id = "esamson",
+            name = "Edward Samson",
+            email = "edward@samson.ph",
+            url = url("https://edward.samson.ph")
+          )
+        ),
+        scalaVersion := "2.12.7",
+        pgpPublicRing := file("./travis/pubring.asc"),
+        pgpSecretRing := file("./travis/secring.asc"),
+        releaseEarlyWith := SonatypePublisher
+      )
+    ),
+    name := "sbt-groovy",
+    scriptedLaunchOpts ++= Seq(
+      "-Xmx2048M",
+      "-XX:MaxMetaspaceSize=512M",
+      s"-Dplugin.version=${version.value}"
+    ),
+    scriptedBufferLog := false
+  )

project/build.properties

@@ -1 +1 @@
-sbt.version=1.0.4
+sbt.version=1.2.6

project/plugins.sbt

@@ -1,2 +1,2 @@
-addSbtPlugin("ch.epfl.scala" % "sbt-release-early" % "2.0.1")
+addSbtPlugin("ch.epfl.scala" % "sbt-release-early" % "2.1.1")
 libraryDependencies += { "org.scala-sbt" %% "scripted-plugin" % sbtVersion.value }