fixed build error

Author: tomoki1207

build.sbt

@@ -3,6 +3,10 @@ organization := "io.github.gitbucket"
 version := "1.0.2"
 scalaVersion := "2.11.8"
 
+resolvers ++= Seq(
+  "bkromhout-maven" at "https://dl.bintray.com/bkromhout/maven/"
+)
+
 libraryDependencies ++= Seq(
   "io.github.gitbucket"  %% "gitbucket"         % "4.9.0"   % "provided",
   "javax.servlet"         % "javax.servlet-api" % "3.1.0" % "provided"