Add short syntax for jitpack repo

core/shared/src/main/scala/coursier/util/Parse.scala

@@ -207,6 +207,8 @@ object Parse {
       ).right
     else if (s.startsWith("ivy:"))
       IvyRepository.parse(s.stripPrefix("ivy:"))
+    else if (s == "jitpack")
+      MavenRepository("https://jitpack.io").right
     else
       MavenRepository(s).right
 

tests/shared/src/test/scala/coursier/test/ParseTests.scala

@@ -42,5 +42,10 @@ object ParseTests extends TestSuite {
       val res = Parse.repository("typesafe:releases")
       assert(res.exists(isMavenRepo))
     }
+
+    "jitpack" - {
+      val res = Parse.repository("jitpack")
+      assert(res.exists(isMavenRepo))
+    }
   }
 }