Add test for semver metadata in version string

This test checks whether the plugin correctly handles
dependencies where the version contains a + character. The
character is commonly used in semver version strings to add
build metadata to the version. Per https://semver.org/

Currently this test fails as the plugin is comparing the
following version strings that do not match:

7.2.27+33-04a1ea9e-SNAPSHOT
7.2.27%2B33-04a1ea9e-SNAPSHOT

Reproduces: cb372#110

src/sbt-test/basic/semver-metadata/build.sbt

@@ -0,0 +1,5 @@
+scalaVersion := sys.props("scala.version")
+resolvers ++= Seq("Sonatype OSS Snapshots" at "https://oss.sonatype.org/content/repositories/snapshots")
+libraryDependencies ++= Seq(
+  "org.scalaz" %% "scalaz-core" % "7.2.27+33-04a1ea9e-SNAPSHOT"
+)

src/sbt-test/basic/semver-metadata/project/plugins.sbt

@@ -0,0 +1 @@
+addSbtPlugin("com.github.cb372" % "sbt-explicit-dependencies" % sys.props("plugin.version"))

src/sbt-test/basic/semver-metadata/src/main/scala/Main.scala

@@ -0,0 +1,10 @@
+import scalaz._
+import scalaz.std.anyVal._
+import scalaz.std.list._
+import scalaz.std.option._
+import scalaz.syntax.equal._ 
+
+object Main {
+  val list1: List[Option[Int]] = List(Some(1), Some(2), Some(3), Some(4))
+  assert(Traverse[List].sequence(list1) === Some(List(1,2,3,4)))
+}

src/sbt-test/basic/semver-metadata/test

@@ -0,0 +1,2 @@
+> unusedCompileDependenciesTest
+> undeclaredCompileDependenciesTest