Merge pull request #554 from http4s/update/series/1.x/sbt-http4s-org-0.17.5

Update sbt-http4s-org to 0.17.5 in series/1.x

Author: danicheg

project/plugins.sbt

@@ -1,5 +1,5 @@
 // http4s organization
-addSbtPlugin("org.http4s" % "sbt-http4s-org" % "0.17.4")
+addSbtPlugin("org.http4s" % "sbt-http4s-org" % "0.17.5")
 
 // ScalaDoc API mapping
 addSbtPlugin("com.thoughtworks.sbt-api-mappings" % "sbt-api-mappings" % "3.0.2")